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A photo cell is illuminated by a small bright source placed one metre away, when the same source of light is placed two metres away, the electron emitted by the photo cathode

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each carries quarter of its previous energy

each carries quarter of its previous momenta

are half as numerous

are one quarter as numerous

answer is D.

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Detailed Solution

From a point source intensity is inversely proportional to square of the distance.

So if distance becomes double intensity becomes one fourth and no. photons emitted is also becomes on fourth of the original.

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