Photons & Photoelectric effect - 3 | Early Quantum Theory

The threshold frequency of copper is ν0 = 1.08 x 1015 s-1.

Calculate the kinetic energy of the electrons ejected from the surface of copper by radiation of wavelength 150 nm.

Ek = hν - hν0 = h (ν - ν0)

and ν = c / λ = 2.00 x 1015 s-1


Ek = (6.626 x 10-34) x (2.00 x 1015 - 1.08 x 1015) = 6.10 x 10-19 J.