Question

The work function of a metal is hv₀. Light of frequency v falls on this metal. Photoelectric effect will take place only if
(a) v ≥ v₀
(b) v > 2v₀
(c) v < v₀
(d) v < v₀/2

Answer 1

(a) v ≥ v₀

As the work function of the metal is hv₀, the threshold frequency of the metal is v₀.

For photoelectric effect to occur, the frequency of the incident light should be greater than or equal to the threshlod frequency of the metal on which light is incident.