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 Note that the intensity of light of a given
frequency is determined by the number of photons incident per second Increasing the intensity will increase the number of emitted electrons per
second