Photoelectric effect explanation using quantum theory | Dual nature of light | Khan Academy

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.

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Created by Mahesh Shenoy