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?
A
1.48ev
B
2.21ev
C
4.42ev
D
5.75ev
E
11.51ev
Verified Correct Answer: B.
Physical Principles & Numerical Solution
K.E = \(\frac{1}{2}\)mv2
E - W = 6.86 - 4.65
= 2.21ev
Source: Myschool Past Questions Archive (Record #33454)