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Example of electrons and photons Electrons and photons example :   To remove one of the least tightly bound electrons from a metal surface, 4.2 eV energy is to be spent. When ultraviolet photons of a single frequency strike a metal, electrons with kinetic energies from zero to 2.6 eV are ejected? What is the energy of the incident photons? Solution : Here: W 0 = 4.2 eV; K.E max = 2.6 eV From Einstein’s photoelectric equation; Energy of the incident photon, E = work function + maximum K.E. of emitted photoelectron I.e.    E = W 0 + K.E max = (4.2 + 2.6) eV = 6.8 eV It means 6.8 eV energy is to be spent to remove one of the least tightly bound electrons from a metal surface. When ultraviolet photons of a single frequency strike a metal, electrons with kinetic energies from 0 to 2.6 eV will be ejected.