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

Options

A. Number of electrons emitted is half the initial number
B. Each emitted electron carries half the initial energy
C. Number of electrons emitted is a quarter of the initial number
D. Each emitted electron carries one quarter of the initial energy

Answer

C

Explanation

Number of electrons emitted prop intensity
`= (1)/((distance)^(2))`
`= 3.65 xx 107 rArr n_(2) = (n_(1))/(4)`