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. each emitted electron carries half the initial energy
B. numer of electrons emitted is a quarter of the initial number
C. each emitted electron carries one quarter of the initial energy
D. number of electrons emitted is half the initial number

Answer

B

Explanation

Intensity of light source is `l prop(1)/(d^(2))`
when distance is doubled, intensity becomes one-fourth. As number of photoelectrons`prop`intensity, so number of photoelectrons is quarter of the initial number.