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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 2m away, the electrons emitted by photo cathodeA. carry one quarter of their previous energyB. carry one quarter of their previous momentaC. are half as numerousD. are one quarter as numerous |
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Answer» Correct Answer - d `Iprop(1)/(d^(2))` When source is placed 2m away then `I=I//4` The number of electrons emitted is derectly proportional to intensity .Hence number of emitted electrons is reduced to one fourth |
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