A metal with a work function of 3.0ev is irradiated with ultraviolet light of energy 4.0 ev. The kinetic energy of the ejected electron is
A
1.0eV
B
3.0eV
C
4.0eV
D
7.0eV
Verified Correct Answer: A.
Physical Principles & Numerical Solution
K.E = hf - Wo
= 4 - 3 = 1eV
Source: Myschool Past Questions Archive (Record #35643)