JIPMER2017PhysicsDual Nature of Matter

A photo cell is illuminated by a small bright source placed 1m away. When the same source of light is placed 2 m away, the electrons emitted by photo cathode

Options

Acarry one quarter of their previous energy
Bcarry one quarter of their previous momenta
Care half as numerous
Dare one quarter as numerous

Correct answer

D. are one quarter as numerous

Step-by-step solution

I ( 1 d^2 ) when source is placed 2 m away, then I^ =I / 4 . The number of electrons emitted is directly proportional to intensity. Hence, number of emitted electrons is reduced to one-fourth.

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