The work function of a metal is 4.65ev and the metal is illuminated with a radiation of 6.86ev. What is the kinetic energy of the electrons ejected from the surface of the metal?
- 1.48ev
-
2.21ev
- 4.42ev
- 5.75ev
- 11.51ev
The correct answer is: B
Explanation
K.E = \(\frac{1}{2}\)mv2E - W = 6.86 - 4.65
= 2.21ev