[ Einstein’s Photo electric equation] The Energy of Photon hv = - TopicsExpress

[ Einstein’s Photo electric equation] The Energy of Photon hv = W + Kmax ----- (1) where W = work function of givenmetal or Kmax = hv – W ----- (2) If the energy of photon absorbed by the electron is less than the work function W of the metal, then electron will not be emitted. if threshold frequency v ̥̥ then Threshold energy of the photon will be hv ̥̥ , Thus , W = hv ̥̥ ---- (3) Using W in equation (2) we get, Kmax = hv – hv ̥̥ Kmax = h (v – v ̥̥ ) ------ (4) but max KE, K max = ½ m(v^2)max --------------- --------------- --------- or | ½ m(v^2)max = h (v – v ̥̥ ) | _______________ _________ This is Einstein’s Photo electric equation

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