7 Einstein’s photoelectric equation is in accordance with the energy
conservation law as applied to the photon absorption by an electron in
the metal The maximum kinetic energy (1/2)m v2
max is equal to
the photon energy (hn ) minus the work function f0 (= hn0) of the
target metal:
1
2 m v2
max = V0 e = hn – f0 = h (n – n0)
This photoelectric equation explains all the features of the photoelectric
effect Millikan’s first precise measurements confirmed the Einstein’s
photoelectric equation and obtained an accurate value of Planck’s
constant h