The graphs show the variation of current $I$ (y -axis) in two photocells A & B as a function of the applied voltage $V$ (x -axis), when light of same frequency is incident on the cell. Which of the following is the correct conclusion drawn from the data?

Cathodes of the two cells are made from the same substance, the intensity of light used are different

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Cathodes are made from differnet substances and the intensity of light is the same

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Cathode substances as well as intensity of ligth are different

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No conclusion can be drawn

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Solution

The correct option is A Cathodes of the two cells are made from the same substance, the intensity of light used are different
The stopping potential depends on the substance of the cathode. Since it is same for A and B, the cathodes are made of the same substance. Since the current of A is greater than the current of B, the lights used are of different intensity.
Light of A is more intense.

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