[" (7) Consider a beam of electrons (each electron with "],[" energy "E_(0)" ) incident on a metal surface kept in an "],[" evacuated chamber.Then,"],[" (a) no electrons will be emitted as only photons can emit "],[" (b) electrons can be emitted but all with an energy,"E_(0)],[" (c) electrons can be emitted with any energy,with a "],[" maximum of "E_(0)-phi(phi" is the work function) "],[" (d) electrons can be emitted with any energy,with a "],[" maximum of "E_(0)]