Each quantum of radiant energy
has energy hn, where h is Planck’s constant and n the frequency of light In photoelectric effect, an electron absorbs a quantum of energy (hn ) of
radiation If this quantum of energy absorbed exceeds the minimum
energy needed for the electron to escape from the metal surface (work
function f0), the electron is emitted with maximum kinetic energy
Kmax = hn – f0
(11 2)
More tightly bound electrons will emerge with kinetic energies less
than the maximum value