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  4. A photoelectric experiment is performed at two different light intensities I1 and I2 (I2 > I1) . Choose the correct graph showing the variation of stopping potential versus frequency of light.

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Q. A photoelectric experiment is performed at two different light intensities $I_{1}$ and $I_{2}$ $\left(I_{2} > I_{1}\right)$ . Choose the correct graph showing the variation of stopping potential versus frequency of light.

NTA AbhyasNTA Abhyas 2020

Solution:

The value of stopping potential depends on the maximum kinetic energy of the photo-electron and thus it is independent of the intensity of light. Therefore, none of the graph shown is correct. The correct graph is shown in the figure.
Solution