A light of energy 5eV falls on a metal and the electrons with a maximum kinetic energy of 2eV are ejected. The work function of the metal is
A
0.4eV
B
2.5eV
C
3.0eV
D
7.0eV
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Work function = 5 - 2
= 3eV
Source: Myschool Past Questions Archive (Record #27857)