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. number 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

Key Idea Number of photoelectrons emitted per second is directly proportional to intensity of light.
Intensity of light source is
`I alpha (1)/(d^(2))`
When distance is doubled, intensity becomes one-fourth.
As number of photoelectrons c intensity, so number of photoelectrons is quarter of the initial number.