A light of energy 5eV falls on a metal and the electrons ...
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
0.4eV
2.5eV
3.0eV
7.0eV
Correct answer is C
Work function = 5 - 2
= 3eV