A photo cell is illuminated by a small bright source placed 1m away. When the same source of light is placed $\frac{1}{2}$ m away. Which of the following is true about the electrons emitted by the photo cathode

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Each carry one quarter of their previous energy

Each carry one quarter of their previous momenta

Are half as numerous

Four time as numerous

answer is D.

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Detailed Solution

$I α \frac{1}{r^{2}},$ intensity of light is increased by 4times, so the no of photo electrons emitted increases by 4 times, there is no change in momentum and energy

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