NEET 2003 Physics question

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then -

(1)each emitted electron carries one quarter of the initial energy
(2)number of electrons emitted is half the initial number
(3)each emitted electron carries half the initial energy
(4)number of electrons emitted is a quarter of the initial numberCorrect

Answer: (4)

Solution

The maximum kinetic energy of each photoelectron depends only on the frequency of light and the work function (), not on the distance of the source. So options (1) and (3) are false. The intensity from a point source varies as \propto$

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Question ID VK-089170