If the minimum (threshold) energy for the emission of an electron from the surface of a particular metal is 3.90 X 10-19 J, what is the kinetic energy of an electron emitted from the surface of the metal when it is irradiated by electromagnetic radiation of wavelength 213 nanometers?

Question

Planck's constant = 6.626 x 10-34 Js
Speed of electromagnetic radiation = 3.0 x 108 ms-1

Kinetic energy of the photoelectron =

I am not sure what steps to use to solve this question.

Answer 1

v is1/2 mv squared 2