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

The correct answer is option (a), which is v ≥ v0.

EXPLANATION:

• The metal has the work function, which is hv0. The metal has the threshold frequency, which is denoted as v0.

• The incident light’s frequency must be equal to or greater than the metal’s threshold frequency for the effect of photoelectricity to happen.  

• The metal’s work function is denoted as hv0. On the metal, the light of frequency v falls.