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