Stopping potential vs frequency graph | Dual nature of light | Physics | Khan Academy

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!

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Created by Mahesh Shenoy