Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/one-di


An overview video of what physics is about as we delve deeper in future videos!

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #youcanlearnanything subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/cosmology-and-

Gravity, Weak, Electromagnetic and Strong. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/big-bang-introduction?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy

Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/light-fundamental-forces/v/introduction-to-light?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy

Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness!

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #youcanlearnanything subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channe....l/UChNPnEkW8LYZ5Rwi8
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

In case you missed it, this is a Physics video! Also, are spherical cows the key to understanding the universe, or maybe not? Not sure. Anyway, learn why modelling and approximations in Physics can be immensely useful!

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 11 Physics here - https://www.khanacademy.org/sc....ience/in-in-class11t

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's figure out the charge on a capacitance in a mixed circuit.


Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's solve a question on Bernoulli's principle!


Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's figure out the value of phase constant under certain conditions!


Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's solve a question on equivalent thermal conductivity

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's solve a question on power dissipated in two bulbs connected in series

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
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Created by

Let's see how to use lens formula (1/v-1/u= 1/f) to locate images without having to draw ray diagrams.

Created by Mahesh Shenoy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/geomet

Virtual Image. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/mirrors-and-lenses/v/parabolic-mirrors-and-real-images?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/dispersion?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #youcanlearnanything subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

In this video, we will explore what diffused (scattered) & specular (regular) reflections are, and also learn the rules governing the reflection of light.
Created by Sal Khan

Let's practice recalling important aspects of mirrors & lenses
More free lessons & practice
https://www.khanacademy.org/sc....ience/in-in-class10t

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Mahesh Shenoy

Let's solve a couple of questions on factors affecting mutual inductance

Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Mutual inductance through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Electromagnetic induction - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics name, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's take some examples and apply Lenz's law to find the direction of induced current!

More free lessons & practice "Link"
Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's figure out how much energy a magnetic field has per unit volume!

More free lessons & practice "Link"
Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Gauss's law for Magnetism says that Magnetic Monopoles are not known to exist. Let's explore where that comes from.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Created by Vibhor Pandey

Let's explore the EMF and flux equations of an AC generator and draw graphs for them.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Mahesh Shenoy

Let's calculate the mutual inductance of two concentric coils with a bigger radius R1, and a smaller radius R2 much smaller than R1.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Mahesh Shenoy

Let's calculate the mutual inductance of two coaxial long solenoids.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Mahesh Shenoy

Let's calculate the self-inductance of a long solenoid.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Mahesh Shenoy

When changing current in one coil induces an EMF in the other, the phenomenon is called mutual induction. The strength of the EMF induced depends on the mutual inductance of the pair of coils. The S.I. unit of mutual inductance is Henry, the same as that of self-inductance.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Mahesh Shenoy

An inductor carrying current is analogous to a mass having velocity. So, just like a moving mass has kinetic energy = 1/2 mv^2, a coil carrying current stores energy in its magnetic field giving by 1/2 Li^2. Let's derive the expression for it using the concept of self-induction.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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Created by Mahesh Shenoy

Self-inductance is the tendency of a coil to resist changes in current in itself. Whenever current changes through a coil, they induce an EMF which is proportional to the rate of change of current, through the coil.

Khan Academy is a nonprofit organization with the mission of providing free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Mahesh Shenoy

Let's explore how to calculate the induced emf in a conducting rod rotating about its end in a uniform magnetic field.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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Created by Mahesh Shenoy

Eddy currents are current loops formed over conductor surfaces due to changing magnetic flux. They are useful in induction heating, levitating, electromagnetic damping, and electromagnetic braking.
They can be minimized by adding slots in the conductor surface & laminating.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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Created by Mahesh Shenoy

A proton and electron have the same kinetic energy, let's compare their de Broglie wavelength. Next, a proton, and an alpha particle are accelerated through the same potential difference, let's compare their de Broglie wavelength.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Created by Mahesh Shenoy

Let's solve some numerical on Einstein's photoelectric equation.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Created by Mahesh Shenoy

Let's explore how the graph of stopping potential vs frequency can be used to calculate the Planck's constant experimentally!
From Einstein's photoelectric equation, this graph is a straight line with the slope being a universal constant. This slope has the value of h/e. In an effort to disprove Einstein, Robert Millikan conducted experiments with various metals only to conclusively prove him right. Millikan, Einstein, and Max Planck, all won a Nobel prize for their contribution to photoelectric effect and giving birth to the quantum nature of light!

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
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Created by Mahesh Shenoy

Let's explore various graphs of photoelectric experiment, and see how changing intensity and frequency changes the graphs.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Created by Mahesh Shenoy

Let's explore how to measure the no. of photoelectrons emitted per second experimentally, in photoelectric effect. We will also draw a graph of the photocurrent vs anode potential.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Created by Mahesh Shenoy

When light of frequency 2.42 X 10^15 Hz is incident on a metal surface, the fastest photoelectrons are found to have a kinetic energy of 1.7eV. Find the threshold frequency of the metal.
Let's explore how to use Einstein's photoelectric equation to solve such numerical on photoelectric effect.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
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Created by Mahesh Shenoy

Light of wavelength 430 nm is incident on each of the metals given in the table. We will explore how to predict which of the metals will show photoelectric emission.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Created by Mahesh Shenoy

Let's explore what work function is, and why, in photoelectric effect, electrons come out with different kinetic energies. While exploring this, we will rediscover Einstein's photoelectric equation

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Created by Mahesh Shenoy

Let's calculate the number of photons emitted per second from a 100 watt light bulb, and the no. of photons hitting the wall per second from a 5W/m^2 intensity laser light.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
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Created by Mahesh Shenoy

Let's explore how the quantum theory of light explains the below experimental results of photoelectric effects.
1. The kinetic energy of the photoelectrons are independent of intensity but depend on frequency.
2. Below a minimum frequency called the threshold frequency, no photoelectric effect takes place, even if the light has very high intensity.
3. Photoelectric effect is almost instantaneous.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Created by Mahesh Shenoy

Let's solve some questions on diffraction slit width

Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Diffraction due to single width through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Wave optics- https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics name, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


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Created by Vibhor Pandey

Let's figure out the angular position of maximas in Single slit diffraction!

00:16 Condition for destructive interference
03:04 Dividing the slit into three parts
06:30 Condition for constructive interference

Master the concept of Diffraction due to single slit through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Wave optics - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


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Created by Vibhor Pandey

Let's solve a couple of questions on the size and intensity of central maxima in single-slit diffraction!

00:00 1st question
00:24 What is the size of the central maximum?
01:39 What is the angular width of the central maximum?
02:16 Condition for destructive interference in a single-slit diffraction
03:09 Deducing change in angular width of central maximum
04:06 Deducing change in the size of central maximum
05:55 2nd question
06:18 Intensity proportional to the square of the amplitude
07:41 Deducing change in intensity when the width of the slit is increased

Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Diffraction in a single slit through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Wave Optics - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned with CBSE syllabus and is available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
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Created by Vibhor Pandey

Let's calculate the expression for the intensity of interfering waves due to coherent sources. The expression turns out to be I =4 Io cos^2 (phi/2)

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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Created by Mahesh Shenoy

Fringe width is the distance between two consecutive bright spots (maximas, where constructive interference take place) or two consecutive dark spots (minimas, where destructive interference take place). Let's derive an expression for the linear and angular fringe width.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
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Created by Mahesh Shenoy

00:00 Example 1
00:35 Breaking down the question + Drawing the set-up
02:08 Approach to solving the question
03:23 Calculating the distance between central and third fringe
04:17 Example 2
04:50 Breaking down the question + Drawing the set-up
06:00 Calculating the distance between the screen and plane of slits

Practice the concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Young's double slit interference through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Alternating Current - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to the CBSE syllabus and is available in Hindi, English and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy

00:07 Example 1
00:45 Breaking down the question
01:19 Approach to solving the question
02:25 Solving for overlapping fringes
04:57 Example 2
05:52 Approach to solving the question
07:28 Solving for the least distance where dark fringes overlap

Practice the concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Young's double-slit experiment through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Wave optics - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to the CBSE syllabus and is available in Hindi, English and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy

Wavefronts are always perpendicular to the rays of light, always! Let's explore why.

More free lessons & practice
https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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Created by Mahesh Shenoy

Huygen's proposed that light is a longitudinal wave in the aether medium - a medium that pervades the entire universe. The set of particles oscillating in phase with each other is called a wavefront. Point sources give out spherical wavefronts, while sources at infinity give plane wavefronts.

More free lessons & practice
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Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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Created by Mahesh Shenoy

Huygen's principle states every point on the current wavefront acts as a source of secondary spherical waves. These secondary waves propagate outwards, in the forward direction, and a common tangent (an envelope) to all these waves constitute the new wavefront.

More free lessons & practice
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Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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Created by Mahesh Shenoy

Huygen's principle states that every point on a wavefront behaves as a source for secondary waves, whose common tangent (envelop) becomes the new wavefront. Using this principle, let's prove the laws of reflection

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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Created by Mahesh Shenoy

Ferromagnets with high retentivity and coercivity are used as permanent magnets (hard magnets), while the ones with low retentivity & coercivity (soft magnets) are used as cores in electromagnets. But all ferromagnets have high permeability.
Let's explore these differences between the permanent magnets and the ones used in electromagnets, by looking at their hysteresis loops.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Mahesh Shenoy

Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Half-life and carbon dating through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Nuclei - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics name, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

In this video, we explore what the rate of decay of radioactive nuclei depends upon and also how we know if the rate is fast or slow.

00:00 Introduction
00:41 How does the rate of decay depend on the number of radioactive nuclei?
04:00 How does the decay constant determine if the rate of decay would be rapid or slow?
06:30 Units of Activity
07:15 Graphing Activity
08:59 Mean life

Master the concept of Half-life and decay rate through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Nuclei - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics , find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's derive an expression for the nuclear radius and calculate a numerical value for the density of a nucleus!

00:07 Recapping Alpha scattering
01:43 What does the distance of closest approach tell us?
03:51 Volume is directly proportional to the mass number
04:57 Deriving an expression for the nuclear radius
06:43 Calculating the density of a nucleus

Master the concept of Nuclear Physics through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Nuclei - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Unstable nuclei can undergo alpha, beta or gamma decay. In this video, we explore when alpha and beta decay occur.

00:00 Introduction
00:35 N/Z ratio
03:38 Plotting N/Z ratio
04:56 Beta minus decay
07:36 Beta plus decay
09:28 Alpha decay

Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Nuclear Physics through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Nuclei - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

We will calculate the magnifying power of a telescope in normal adjustment, given it's objective and eyepiece focal lengths.
Created by Mahesh Shenoy

Let's figure out the magnifying power (magnification) of our telescope.

Created by Mahesh Shenoy

Let's explore how telescopes work intuitively using a demo. Then we will talk about some nuances involved in ray diagram and derive an expression for magnifying power.

Created by Mahesh Shenoy

Let's solve a numerical on compound microscope.

Created by Mahesh Shenoy

Let's explore the principle of a compound microscope and then logically build one, step by step.

Created by Mahesh Shenoy

Let's explore our magnifying glass a little more and see what's the min. and maximum magnification it can give.
Created by Mahesh Shenoy

Let's explore how a magnifying glass (simple microscope) really works.

Created by Mahesh Shenoy

Let's help our friend, Veena, to select the right lens for her eyes.
Created by Mahesh Shenoy

Let's help our friend, Suresh, to pick the right lens for his glasses.

Created by Mahesh Shenoy

Let's explore what are the symptoms and causes of Presbyopia. We will also see how bifocals correct them.

Created by Mahesh Shenoy

Let's explore the common defects, Myopia (shortsightedness) and hypermetropia (farsightedness) using ray diagrams.

Created by Mahesh Shenoy

Why do distant things get blurred when we concentrate on things close to us? Why can't we see things which are very close to us?
Let's explore how our eyes work and get answers to questions like these by exploiting the power of ray diagrams

Created by Mahesh Shenoy

Let's explore cornea, pupil, iris, crystalline lens, ciliary muscles, aqueous & vitreous humour, retina, & optic nerves. We will study their structure & functions.

Created by Mahesh Shenoy

Let's explore why the sky is blue, why the sunset/sunrise is red, why are clouds white. It's all due to scattering of light by the molecules of our atmosphere

Created by Mahesh Shenoy

Let's explore the scattering of light with the help of an experiment. When we shine a laser through a glass of water with few drops of milk, we can see the path of light. This effect is often called the Tyndall effect. Created by Mahesh Shenoy

Why do we see the sun even before it rises?
More free lessons & practice -https://www.khanacademy.org/sc....ience/in-in-class10t

Khan Academy is a nonprofit organisation with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organisation, we would love your help!

Created by Mahesh Shenoy

What causes the twinkling effect of stars (but not planets)?
More free lessons & practice -https://www.khanacademy.org/sc....ience/in-in-class10t

Khan Academy is a nonprofit organisation with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organisation, we would love your help!

Created by Mahesh Shenoy

Power is an incredibly useful quantity when it comes to lenses. Let's find out what it is and where it is used.


Created by Mahesh Shenoy

Let's figure out the effective focal length when thin lenses are in contact.

Created by Mahesh Shenoy

Let's derive the thin lens formula which connects the object distance to the image distance.

Created by Mahesh Shenoy

Using lens formula can be tricky because we need to substitute using signs. In this video, we will take one example and discuss how to use the lens formula.


Created by Mahesh Shenoy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/geomet

Concave Lenses. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/mirrors-and-lenses/v/object-image-and-focal-distance-relationship-proof-of-formula?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/mirrors-and-lenses/v/convex-lens-examples?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/geomet

Convex Lens Examples. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/mirrors-and-lenses/v/concave-lenses?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/mirrors-and-lenses/v/convex-lenses?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/geomet

Convex Lenses. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/mirrors-and-lenses/v/convex-lens-examples?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/mirrors-and-lenses/v/convex-parabolic-mirrors?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Can a convex lens diverge beam of light?
Let's do some problem-solving. Let's figure out the focal length of the convex lens when it's kept in air and oil.

Created by Mahesh Shenoy

Short derivation of the lens maker formula using curved surface refraction formula. This formula connects the focal length of a lens to its refractive index & the radii of curvatures. To make the derivation short, we skip using the sign conventions.

Created by Mahesh Shenoy

Let's solve a numerical on a curved surface refraction
Created by Mahesh Shenoy

Let's derive a formula connecting object distance (u) and image distance (v) for refraction at a curved surface.

Created by Mahesh Shenoy

What makes the 22 degrees halo, 22 degrees?
Let's derive an expression for the angle of minimum deviation.
Created by Mahesh Shenoy

What causes the famous 22-degree halo around the sun? In this video let's explore the concept of minimum deviation in a prism and how that results in beautiful halo formations.

Created by Mahesh Shenoy

Let's explore how Sir Issac Newton experimentally proved that white light is made of all the colours of the rainbow.
Created by Mahesh Shenoy

By doing an experiment let's explore what prisms are and what happens to white light as it passes through a prism.
Created by Mahesh Shenoy

The index of refraction in a material isn't always the same for every wavelength. This is how prisms split white light into so many colors. Created by David SantoPietro.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/mirrors-and-lenses/v/virtual-image?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/total-internal-reflection?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/geomet

Critical incident angle and total internal reflection. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/dispersion?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/snell-s-law-example-2?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Let's find an expression between the relative refractive index and absolute refractive index

Created by Mahesh Shenoy

Let's explore the refractive index in detail. We will see the difference between absolute and relative refractive index
Created by Mahesh Shenoy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/geomet

Snell's Law Example 2. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/total-internal-reflection?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/snell-s-law-examples-1?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/geomet

Snell's Law Example 1. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/snell-s-law-example-2?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/refraction-in-water?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Let's explore refraction of light through any parallel sided medium. Will also see why things appear to shift (lateral shift) when looked through such a medium.
Created by Mahesh Shenoy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/geomet

Refraction in Water. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/snell-s-law-examples-1?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/refraction-and-snell-s-law?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/geomet

Refraction and Snell's Law. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/refraction-in-water?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/specular-and-diffuse-reflection-2?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Physics channel: https://www.youtube.com/channe....l/UC0oGarQW2lE5PxhGo
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

We will find the properties of the image formed by a convex mirror.
We will do that using the mirror formula and by applying the sign convention.
Created by Mahesh Shenoy

Let's explore how we can generalize the mirror formula by introducing cartesian sign conventions.

Created by Mahesh Shenoy

In this video, we will derive the mirror formula (expression connecting u,v, and f) and magnification formula.
We will use a concave mirror to do it.

Created by Mahesh Shenoy

Let's explore the ray tracing technique to figure out the properties of images when things are kept in front of a concave or a convex mirror.

Created by Mahesh Shenoy

In this video, we will introduce the terms radius of curvature, and see its connection with focal length.
We will also introduce the term principal axis and see the need for it.
Created by Mahesh Shenoy

In this video, we will explore two kinds of curved mirrors, parabolic and spherical mirrors.

Created by Mahesh Shenoy

In this video, we will look at some applications of concave mirrors.
Created by Mahesh Shenoy

When curved mirrors have a reflecting surface on the outside, they are called convex mirrors. (vex stands for bulging out).
Let's learn what they do and their applications in our day to day life.

Created by Mahesh Shenoy

In this video, we will see how concave mirrors focus a parallel beam of light to a single point.

Created by Mahesh Shenoy

In this video, we solve a question on Snell's window and also deal with refraction and TIR across 3 mediums!

00:06 1st Question
00:51 Drawing all the light rays from the source
02:38 How do the light rays look when they are incident at critical angle?
03:01 Using Snell's law to calculate the critical angle
03:59 Relating critical angle with the angle subtended at the source
04:55 2nd Question
05:48 Comparing the refractive indices of the three mediums
07:43 Using Snell's law to relate the refractive indices of medium A and B

Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Refraction at plane surfaces through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Ray optics and Optical instruments - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

We use sign convention once in derivation, and once while solving problems. Why do we use it twice? Let's understand that in this video!

00:00 Introduction
00:28 Deriving mirror equation for a concave mirror
04:21 Deriving mirror equation for a convex mirror
08:59 Different equations for different cases
09:28 Applying sign convention once
11:01 Benefit of using sign convention once
11:28 Applying sign convention the second time
13:31 Same goes for lenses

Master the concept of Refraction of light by spherical mirrors through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Ray optics and optical instruments - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics name, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

In this video, we solve two questions on the image formed by multiple lenses

00:00 1st question
01:00 Strategy
02:50 Using thin lens formula to calculate image formed by the first lens
04:19 Using thin lens formula to calculate image formed by the second lens
05:49 2nd question
06:52 Drawing the set-up
08:09 Strategy
09:21 Using thin lens formula to calculate image formed by the first lens
10:00 Calculating image distance for the second lens


Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of multiple lenses through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Refraction in thin lenses - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's explore some applications of total internal reflection!

00:00 Introduction
00:28 Recap TIR
01:28 Diamonds
05:30 Snell's window
09:15 Prisms - Binoculars

Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Total internal reflection through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Ray optics and optical instruments - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's explore virtual objects and how to use the idea of virtual objects in numericals

00:00 Virtual object in a plane mirror
03:09 Virtual object in a thick convex lens
09:12 Using virtual objects in questions with multiple thin lenses

Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Refraction in thin lenses through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Ray optics and optical instruments- https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics -https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Let's solve a couple of questions on magnification in mirrors

Practice this concept - https://www.khanacademy.org/sc....ience/in-in-class-12

Master the concept of Reflection of light by spherical mirrors through practice exercises and videos - https://www.khanacademy.org/sc....ience/in-in-class-12

Check out more videos and exercises on Ray optics and optical instruments - https://www.khanacademy.org/sc....ience/in-in-class-12

To get you fully ready for your exam and help you fall in love with Physics name, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/sc....ience/in-in-class-12

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.


Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.


Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Activity: https://youtu.be/0tA74AkEAOc

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

What is the difference and similarity between periodic and oscillatory motion Let's find out!

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Rutherford discovered the structure of the atom! Let's understand his model through a simple activity!

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

What produces a sound? Let's understand that through a small activity!

Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages.

Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy.

Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy

As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Vibhor Pandey

Wheatstone bridge is a special circuit consisting of 5 resistors. When the resistances in the adjacent arms have the same ratio, no current flows through the middle resistor! This is called a balanced Wheatstone bridge.
It's used in calculating unknown resistances using a meter-bridge set up.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Created by Mahesh Shenoy

Part of NCSSM CORE collection: This video shows the collection of data to determine the specific heat of a metal. http://www.dlt.ncssm.edu

Please attribute this work as being created by the North Carolina School of Science and Mathematics. This work is licensed under Creative Commons CC-BY http://creativecommons.org/licenses/by/3.0

Help us caption & translate this video!

http://amara.org/v/GAgU/

In this video, David explains how Louis De Broglie got his Nobel Prize for the idea of matter having a wavelength.

This lecture has been viewed about 17 million times. About 1 million times on MIT's OCW, 7 million times in the channel "For the Allure of Physics" and about 9 million times in this channel. Walter Lewin puts his life on the line to demonstrate that he is a strong believer in the conservation of energy. He explained why the sky is blue, why the clouds are white and why sunsets are red. Great demonstrations! MIT video streamed this lecture in real time. It was viewed live by about 25 thousand people all over the world.

The narrower the pipe section, the lower the pressure in the liquid or gas flowing through this section. This paradoxical fact, following from the law of conservation of energy, is called the Bernoulli principle or law.

The scales of the universe refer to the different sizes at which objects and phenomena exist in the cosmos. Here are some commonly used scales of the universe, ranging from the smallest to the largest:

1. Quantum Scale: This scale deals with the behavior of subatomic particles, such as quarks, leptons, and bosons. It is described by quantum mechanics and includes phenomena like particle interactions, wave-particle duality, and quantum entanglement.

2. Atomic and Molecular Scale: At this scale, objects such as atoms and molecules exist. It includes the study of atomic structure, chemical bonding, and molecular interactions. Fields like chemistry and molecular biology operate at this scale.

3. Cellular and Biological Scale: This scale encompasses the study of living organisms and their cellular components. It includes cells, organelles, and biological molecules like DNA, proteins, and enzymes. Biology and genetics are primarily concerned with this scale.

4. Human Scale: This scale relates to the size and dimensions of the human body and objects that we commonly interact with. It includes human anatomy, physiology, and various human-made structures such as buildings and vehicles.

5. Planetary Scale: At this scale, celestial bodies like planets, moons, asteroids, and comets exist. It includes the study of their formation, geology, atmosphere, and interaction with other bodies in the solar system.

6. Stellar Scale: This scale encompasses stars and their properties, such as their size, mass, temperature, and brightness. Stellar evolution, fusion reactions, and the life cycle of stars are studied at this scale.

7. Galactic Scale: At this scale, galaxies exist, which are vast collections of stars, gas, dust, and dark matter. It includes the study of galaxy formation, structure, dynamics, and the interactions between galaxies.

8. Cosmic Scale: This scale deals with the large-scale structure of the universe, including galaxy clusters, superclusters, and cosmic voids. It involves studying the distribution of matter and the large-scale properties of the universe, such as its expansion and the cosmic microwave background radiation.

9. Universal Scale: This is the largest scale encompassing the entire observable universe. It includes all matter, energy, space, and time. Understanding the origin, evolution, and fate of the universe itself is the primary focus at this scale.

These scales help scientists categorize and study objects and phenomena based on their sizes and characteristics, allowing us to better comprehend the vastness and complexity of the universe.

A Level Physics Advanced Information Revision : ) Experimental skills in materials are important in the OCR Advanced Information but also relevant to other exam boards.
Please note that is not a complete list and many many different variation of experiments could come up in practicals.

Full in depth playlist of online lessons on materials: https://www.youtube.com/playli....st?list=PLSygKZqfTjP
Note: springs in series and parallel should be included in this video as well. Please see this here:
https://youtu.be/WMHC4txjK0k

Chapters:
00:00 Intro
00:15 Tensile and Compressive Forces
00:58 Hooke's Law
02:25 Hooke's Law experiment
04:27 Work Done by a spring and Elastic Potential Energy
06:38 Stress strain
08:45 Ultimate Tensile Strength
09:48 Young's Modulus
10:48 Experiment to determine Young's Modulus
17:06 Ductile material, elastic and plastic deformation
17:57 Ductile material - Stress and Strain Graph
19:26 Brittle Material - Stress and Strain Graph
20:07 Rubber and Polyethene - Stress and Strain Graph

This is excellent A Level Physics revision for all exam boards including OCR A Level Physics, AQA A level Physics, Edexcel A Level Physics, CIA Cambridge International A Level Physics, Eduqas etc.

Forces in physics refer to the interactions between objects that cause changes in their motion or shape. They are described using Newton's laws of motion and are crucial in understanding the behavior and motion of objects in the physical world. Here are some common types of forces in physics:

1. Gravitational Force: This force is responsible for the attraction between objects with mass. It is the force that keeps planets in orbit around the sun and objects grounded on the Earth.

2. Normal Force: The normal force is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface, preventing objects from falling through it.

3. Frictional Force: Friction is the resistance that opposes motion when two objects come in contact. It occurs due to the roughness of surfaces. Frictional force acts parallel to the surfaces in contact and can either be static (preventing motion) or kinetic (opposing motion).

4. Tension Force: Tension is the force exerted by a string, rope, or a similar object when it is pulled at both ends. It transfers force uniformly along its length and is responsible for maintaining the integrity of the object.

5. Applied Force: An applied force is the force exerted on an object by a person or object. It can be used to push, pull, or move an object in various directions.

6. Spring Force: When an elastic object, such as a spring, is compressed or stretched, it exerts a force according to Hooke's law. This force is directly proportional to the displacement from the object's equilibrium position.

7. Electrical Force: Electrical forces exist between charged particles, such as electrons and protons. Like charges repel each other, while opposite charges attract.

8. Magnetic Force: Magnetic forces result from the interaction between moving charged particles (currents) or magnetic fields. Magnets can attract or repel each other based on their poles.

9. Buoyant Force: Buoyant force acts on objects immersed in a fluid (liquid or gas) and is directed upward. It is responsible for the ability of objects to float in a fluid and is determined by the density of the fluid and the displaced volume.

These are just a few examples of forces in physics. Understanding and analyzing these forces is essential in the study of mechanics and other branches of physics, allowing us to predict and explain the behavior of objects in various scenarios.

Resolving forces in depth video: https://youtu.be/GqyI3zl9P_oArchimedes Principle in depth video: https://youtu.be/mDavwJOiYJYChapters:00:00 F=ma, The net force02:18 The Newton02:40 Free Body Diagrams, Types of Forces08:05 Net Force Example Question11:48 Drag16:06 Experiment: Motion of a ball through a viscous liquid18:32 Resolving Forces on a slope21:42 Centre of gravity, experiment23:48 Moments26:20 Non perpendicular Moments29:05 The Principle of Moments30:44 Force Couples and Torque32:00 Triangle of forces34:19 Density and Pressure35:00 Pressure at a height, h.37:00 Archimedes PrincipleThis is excellent A Level Physics revision for all exam boards including OCR A Level Physics, AQA A level Physics, Edexcel A Level Physics, CIA Cambridge International A Level Physics, Eduqas etc.

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Full list of my revision videos:
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My online lessons on motion:
https://www.youtube.com/playli....st?list=PLSygKZqfTjP

Chapters:
00:00 Independence of vertical and horizontal motion
01:31 Vertical and horizontal components
02:55 How the components vary
04:44 Calculating the maximum height
07:17 Maximum Range

This is excellent A Level Physics revision for all exam boards including OCR A Level Physics, AQA A level Physics, Edexcel A Level Physics, CIA Cambridge International A Level Physics, Eduqas etc.

Get my Uncertainty Workbook: https://koji.to/k/9uCs
Teacher Version (for your entire institution): https://koji.to/k/9uCx

All of my revision videos:
https://www.youtube.com/playli....st?list=PLSygKZqfTjP

Please also revise:
Graphical methods:
https://youtu.be/tMkSM6gFKWM

Uncertainty from a data set:
https://youtu.be/JIJf_aNUDaw

Foundations of Physics complete playlist with more examples and online lessons on uncertainties:
https://www.youtube.com/playli....st?list=PLSygKZqfTjP

Chapters:
00:00 Intro
00:18 Absolute Uncertainties
01:33 Percentage Uncertainties
03:44 Combining Uncertainties
04:14 Adding or Subtracting
06:31 Multiplying or Dividing
08:21 Raising to a power

My Physics Workbooks: https://zphysicslessons.net/my-worksheets
Next step: Vectors practice questions: https://youtu.be/tMr--psNVxM

Part 1 Foundations of Physics: https://youtu.be/WOckc29sZJA
All the Maths for A Level Physics: https://youtu.be/neBotgd2PKA
Credit: Music for the intro: "At the top", provided by Camtasia included Royalty Free Music
Chapters:
00:00 Intro
00:15 Scalars and Vectors
03:09 Distance and displacement
04:51 adding parallel vectors
05:39 adding perpendicular vectors
08:47 resolving vectors
14:46 adding non-perpendicular vectors - scale diagram
16:31 adding non-perpendicular vectors - sine and cosine rules
20:47 adding non-perpendicular vectors - resolution

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Part 2: All of projectile Motion:
https://youtu.be/WRWFpYeETHM

Instantaneous velocity video: https://youtu.be/aV47J1Leam4
Chapters:
00:00 Intro
00:37 Distance and displacement
01:55 Average speed and velocity
03:52 Instantenous velocity and the gradient of the tangent
06:39 Displacement time graphs and distance time graphs
07:43 Acceleration
09:16 the area under a velocity time graph is displacement
10:10 SUVAT equations and examples
17:04 Falling under gravity
18:17 Calculating the maximum height
21:38 An experiment to determine g, method 1
26:42 An experiment to determine g, method 2
27:45 Proofs and derivations of the SUVAT equations
36:00 Stopping distance, thinking distance and braking distance

This is excellent A Level Physics revision for all exam boards including OCR A Level Physics, AQA A level Physics, Edexcel A Level Physics, CIA Cambridge International A Level Physics, Eduqas etc.

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A rather long video covering the section on Quantum Physics on the OCR Physics A specification, however applicable to all exam boards. Remember, after you have revised the content - time for practice questions! : )

Check out all of my revision videos:
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This is excellent A Level Physics revision for all exam boards including OCR A Level Physics, AQA A level Physics, Edexcel A Level Physics, CIA Cambridge International A Level Physics, Eduqas etc.
Chapters:
00:00 Photons
01:26 Energy of a Photon
03:06 Base Unit of Planck's constant, h
04:40 The Electronvolt, eV conversion factors
06:24 Photoelectric Effect, Work Function, Threshold Frequency
10:03 The Gold Leaf Electroscope Experiment
13:50 Einstein's Photoelectric Effect Equation
19:13 Why Maximum Kinetic Energy?
20:27 Graphs
22:19 Wave Particle Duality - Electron Diffraction
23:40 De Broglie Wavelength

Equation of State of an Ideal Gas
NOTE: at the end, the conversion between Kelvin and Celsius should use 273 rather than 237.

Demonstration of the calculations of the resultant force and direction for a concurrent co-planar system of forces.

This video demonstrates the tabular method for 2d systems.

Get more lessons like this at http://www.tebtalks.comIn this lesson, you will learn an introduction to physics and the important concepts and terms associated with physics 1 at the high school, college, or university level.We will review Newton's laws of motion, projectile motion, force, energy (potential and kinetic energy), gravitation, momentum, collisions and more.

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Five areas of physics worth remembering: Classical mechanics, energy and thermodynamics, electromagnetism, Relativity, and Quantum Mechanics. Classical mechanics - two main concepts worth knowing. The first is Newton’s second law: F= ma: Force equals mass times acceleration. If you apply a force to a fixed mass, it tells you how much acceleration you will get. And knowing acceleration which is the change in velocity, you can make predictions.

The second equation is the law of universal gravitation. it allows us to determine the motion of heavenly bodies. It says that the gravitational attraction between two bodies is the product of their masses divided by the distance between them squared, times a constant, called Newton’s gravitational constant.

Energy is not a vector like force or momentum, but it is just a number. Work is closely related to energy. It is force times distance traveled. Energy for most objects consists of kinetic energy plus potential energy. KE is the energy of motion, It is KE = ½ M V^2 – the more mass you have and/or the more velocity you have, the more energy you have.

Gravitational potential energy is expressed as PE = m g h – mass times the gravitational acceleration times the height. The total energy of an object is both Kinetic energy plus potential energy. Potential energy can take many forms. Gasoline or petrol has chemical potential energy. Important: Energy is always conserved. It is not created or destroyed. It only changes form.

Thermodynamics is the study of work, heat, and energy on a system. We showed energy is how much work you could do. But another form of energy is thermal energy. If a car is moving and you apply the brakes, the kinetic energy of the car gets converted to thermal energy, created by friction of the car’s brakes. Temperature is the average kinetic energy of atoms in a system. Thermal energy is the total kinetic energy of atoms in a system.

Entropy is a measure of disorder, or more accurately, the information required to describe the micro states of a system. The 2nd law of thermodynamics states that entropy of an isolated system can never decrease. Energy at lower entropy can do more work than energy at high entropy. The one way flow of Entropy seems to be the only reason we have a forward flow of time.

Electromagnetism is the study of the interaction between electrically charged particles. The essentials are in Maxwell’s equations. If you have a static object with a charge, it will affect only other charges. If you have a static magnet, it will affect only other magnets. It will not affect charges. But if you have a moving charge, it will affect a magnet. And if you have a moving magnet, it will affect a charge. The constants mu naught and epsilon naught are the permeability and permittivity of free space. These two constants determine the speed of light because they measure the resistance of space to changing electric and magnetic fields.

Special Relativity: Einstein presumed that the speed is the same in any frame of reference. This was one of the postulates.
The second postulate was principle of relativity - the laws of physics are the same for all observes who are moving at the same velocity relative to each other. Einstein showed that the only way these can be true is if time was not fixed, but was relative.

General relativity: Later Einstein showed using the same assumptions, there would be no way to tell if you were in an accelerating reference frame or standing stationary on earth. A flashlight beam will bend in gravity. But since light always takes the shortest path between any two points, this means that space-time itself is bending.

Quantum mechanics: Three principles are important. First by Max Planck, says that energy is not continuous, but is quantized. The amount of energy equals the frequency of the radiation times Planck's constant. Using this, Einstein later showed that a photon is both a wave and a particle.

The second is the Heisenberg's uncertainty principle: you cannot know both a particle’s exact position and it’s exact momentum at the same time. For a particle with mass, this means if you know exactly where a particle is, you don’t know how fast going. If you know exactly how fast it’s going, you don’t know where it is.
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Schrodinger's equation: prior to measurement, quantum systems are in superposed states. This means that their properties can only be expressed as a wave function. A wave function simplified, is a set of probabilities. So in a hydrogen atom, you can’t know where to find the electron in advance. All you can know is the probability of where you might find it, if you measured it. Prior to measurement, all quantum systems are waves of probabilities. This is not a limitation of our measuring devices. It is a limitation of reality.
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This chemistry video tutorial provides a basic introduction into the 4 states of matter such as solids, liquids, gases, and plasma. Solids have a definite shape and volume. Liquids have a definite volume but not a definite shape since they assume the shape of the container. Gases do not have a definite volume or shape. Solids and gases are fluid which mean they have the ability to flow. Plasma is an ionized gas that can conduct electricity. Solids and liquids have a relatively high density and gases have a low density.

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Chemistry - Basic Introduction: https://www.youtube.com/watch?v=-KfG8kH-r3Y
Scientific Notation Review: https://www.youtube.com/watch?v=ZtB0vJMGve4
Significant Figures Review: https://www.youtube.com/watch?v=l2yuDvwYq5g
Unit Conversion Problems: https://www.youtube.com/watch?v=eK8gXP3pImU
Accuracy and Precision: https://www.youtube.com/watch?v=0IiHPKAvo7g
Density Practice Problems: https://www.youtube.com/watch?v=9CKDQE35qXQ
Pure Substances & Mixtures: https://www.youtube.com/watch?v=OHhnm2p5G3o
Homogeneous & Heterogeneous Mixtures: https://www.youtube.com/watch?v=eI-tmv4DLEk
Physical and Chemical Changes: https://www.youtube.com/watch?v=YE2xaMsoGFU
Solids, Liquids, Gases, & Plasma: https://www.youtube.com/watch?v=9TVOlTolKFA
Physical Vs Chemical Properties: https://www.youtube.com/watch?v=gH1R87ahFvA
Law of Conservation of Mass: https://www.youtube.com/watch?v=eBTNzScLUg4
Law of Definite Proportions: https://www.youtube.com/watch?v=ly0ywRdVG_M
Law of Multiple Proportions: https://www.youtube.com/watch?v=sxE95VOY-YY
Rutherford's Gold Foil Experiment: https://www.youtube.com/watch?v=sNQsdrqsD_s
Cathode Ray Tube Experiment: https://www.youtube.com/watch?v=i6zyPOSreCg
Atoms - Basic Introduction: https://www.youtube.com/watch?v=acdkMeEKCNQ
Cations and Anions Explained: https://www.youtube.com/watch?v=aAV2DMAI5f8
Diatomic Elements & Molecules: https://www.youtube.com/watch?v=gi337Mx7wTc
Elements, Atoms, & Molecules: https://www.youtube.com/watch?v=pSJeMJaCkVU
Protons, Neutrons, & Electrons: https://www.youtube.com/watch?v=65dDZulPhtg
Average Atomic Mass: https://www.youtube.com/watch?v=JT18bDAadQ0
What Are Isotopes? https://www.youtube.com/watch?v=bagegEZBtOs
Ionic and Covalent Bonding: https://www.youtube.com/watch?v=uDFLHTDJ4XA
Naming Molecular Compounds: https://www.youtube.com/watch?v=3agUL7-ezXk
Writing Formulas - Molecular Compounds: https://www.youtube.com/watch?v=KrJnnwLDY6o
Naming Ionic Compounds: https://www.youtube.com/watch?v=5rSgduXqhhU
Writing Formulas - Ionic Compounds: https://www.youtube.com/watch?v=GJ4Mds0CWLE
Writing Formulas - Polyatomic Ions: https://www.youtube.com/watch?v=stu2omPRvbs
Introduction to Moles: https://www.youtube.com/watch?v=EowJsC7phzw

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This physics video tutorial explains the concept behind Newton's First Law of motion as well as his second and third law of motion. This video contains plenty of examples and practice problems. This video is useful for high school and college students studying physics.


Physics Basic Introduction and Final Exam Review:
https://www.video-tutor.net/ph....ysics-basic-introduc


Here is a list of topics on Newton's 3 Laws of Motion:
1. Newton's First Law of Motion - An object at rest will remain at rest unless acted on by an unbalanced force.
2. Second Part of Newton's First Law of Motion - An object in motion will continue in motion unless acted on by a net force
3. The net force is zero when an object moves with constant velocity
4. Newton's 1st Law of Motion Examples & Demonstrations - Ball rolling on a rough surface with friction such as a carpet vs a ball rolling on a smooth surface such as ice with very little kinetic friction.
5. Earth moves continually in space - lack of frictional forces
6. Newton's Second Law of Motion - Force = Mass times acceleration
7. Newton's 2nd Law of Motion - Force is proportional to mass and acceleration. Mass and acceleration are inversely related when the force applied is constant.
8. Newton's Third Law of Motion - Action Reaction Pairs. For every action force, there is an equal but opposite reaction force.
9. Newton's 3rd Law of Motion Examples - Astronaut throwing a ball in space. Fisherman throws a package out into see and experiences a recoil velocity.
10. Impulse equals force multiplied by time
11. Momentum - Mass in Motion. Momentum equals mass times velocity.
12. Scalar vs Vector Quantities - Magnitude and Direction
13. Impulse - Momentum Theorem
14. Variation of Newton's Second Law of Motion - Force is the rate of change of momentum
15. Applied Force, Frictional Force, Normal Force vs Weight Force
16. How to calculate Final Velocity / Speed Using Acceleration
17. Acceleration is the rate of change of velocity
18. One Dimension Kinematics Formulas

Physics - Basic Introduction: https://www.youtube.com/watch?v=b1t41Q3xRM8
Physics 1 Formulas: https://www.youtube.com/watch?v=E8C06X-v0_A
Newton's 1st Law of Motion: https://www.youtube.com/watch?v=Fr5EMXZaujc
Newton's 2nd Law of Motion: https://www.youtube.com/watch?v=Ee6CHn0MRKE
Newton's 3rd Law of Motion: https://www.youtube.com/watch?v=TxhESW6YtOg
Mass Vs Weight: https://www.youtube.com/watch?v=LB_WoV071vc
Free Body Diagrams: https://www.youtube.com/watch?v=52R61aSWHg0
Normal Force Problems: https://www.youtube.com/watch?v=uyJTwljKSJ4
Elevator Physics Problem: https://www.youtube.com/watch?v=sVVKpRvuNG0
Net Force Physics Problems: https://www.youtube.com/watch?v=tfAJDST3cjo
What Is a Normal Force? https://www.youtube.com/watch?v=fRQq4_ry9-Q
Static Friction and Kinetic Friction: https://www.youtube.com/watch?v=RIBeeW1DSZg
Contact Forces: https://www.youtube.com/watch?v=Iin29KFE4So
Tension Force Problems: https://www.youtube.com/watch?v=F5oqJ5t-pa4
Types of Forces: https://www.youtube.com/watch?v=E626-DiQgRs
Inclined Planes: https://www.youtube.com/watch?v=ufgY237M5KQ
Simple Machines: https://www.youtube.com/watch?v=WI8j3UlR-SE
Pulley Physics Problems: https://www.youtube.com/watch?v=N6IhkTjWrd4
The Pulley - Simple Machines: https://www.youtube.com/watch?v=GAegAHnfkMs
The Lever - Simple Machines: https://www.youtube.com/watch?v=0HSJx3CHZJ4
Mechanical Advantage: https://www.youtube.com/watch?v=SPTNKnCqlW4
What Is a Force? https://www.youtube.com/watch?v=vZ0ehaOEZKE
The 4 Fundamental Forces: https://www.youtube.com/watch?v=k1jaDh97Q_g
Physics Forces Review: https://www.youtube.com/watch?v=pL2YfC-22Uc
Physics 1 Final Exam Review: https://www.youtube.com/watch?v=CwkhvFlNFp0

introduction to physics

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⁣Projectile motion is a form of motion experienced by an object or particle (a projectile) that is projected in a gravitational field, such as from Earth's surface, and moves along a curved path under the action of gravity only.

A ray of light is the path along which the lights travel. Rays are observable. They travel along the straight line in a similar homogeneous medium and are represented by straight lines with arrowheads. The arrowhead indicates the path of light. Consider a plane-mirror and a fixed incident ray of light reflecting from the surface at an angle θ. Before the mirror has rotated, the angle of incidence is θ as is the angle of reflection.

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The light traveling in any one direction in a straight line is called a ray of light. A group of light rays given out from a source is called a beam of light.

⁣A ray of light that is incident on to the surface of a plane-mirror is reflected with the angle of incidence equal to the angle of reflection. Suppose that the ray had continued, through the mirror, in a straight line it would make an angle θ with the surface of the mirror. The total angle between the straight-line path and the reflected ray is twice the angle of incidence. This is called the deviation of the light and measures the angle at which the light has strayed from its initial straight-line path

The principle of reversibility states that light follows the same path if the direction of light is reversed. The refractive index of light when it passes from the first medium to the second medium is the same as the refractive index of light when it goes from second medium to the first medium.

What is Reflection on a Plane Mirror? When the light rays get stroked on the flat mirror, they get reflected back. According to the laws of reflection, the angle of reflection is equal to the angle of incidence. Get more lessons at https://tebtalks.com/

By learning advanced physics, the students will be give the chance to understand the laws and applications of motion, forces, and gravity. Understanding of the processes of work and energy and the laws of thermodynamics. Understanding of how light and sound waves function in our environment, principles of electricity and magnetism and how they are applied.