A photo cell is illuminated by a small bright source placed $$1m$$ away. When the same source of light is $$placed12$$ m away. Which of the following is true about the electrons emitted by the photo cathode

Correct option is 4Four time as numerous

Questions

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

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detailed solution

Correct option is D

Iα1r2, 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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A photo cell is illuminated by a small bright source placed 1m away. When the same source of light is placed12 m away. Which of the following is true about the electrons emitted by the photo cathode

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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