A metal with a work function of 3.0ev is irradiated with ...
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
1.0eV
3.0eV
4.0eV
7.0eV
Correct answer is A
K.E = hf - Wo
= 4 - 3 = 1eV