Question

A point source of light is used in a photoelectric effect. If the source is removed farther from the emitting metal, the stopping potential
(a) will increase
(b) will decrease
(c) will remain constant
(d) will either increase or decrease

Answer 1

(c) will remain constant
As the source is removed farther from the emitting metal, the intensity of light will decrease. As the stopping potential does not depend on the intensity of light, it will remain constant.

$V_s=\frac{hc}{\lambda e}-\frac{{\theta }_0}{e}$

$aswecannoticethatstoppingpotentialdoesntdependsuponintensityoflight$