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Q.

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

Each carry one quarter of their previous energy

b

Each carry one quarter of their previous momenta

c

 Are half as numerous   

d

Four time as numerous

answer is D.

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Detailed Solution

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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