1) Suppose a beam of electron with each electron having energy E0 incident on a metal surface kept in an evacuated chamber. Then A) Electron can be emitted with any energy with a maximum of $E_{0}$ B) No electrons will be emitted as only photons can emit electrons C) Electrons can be emitted but all with an energy $E_{0}$ D) Electrons can be emitted with any energy with maximum $E_{0}$- $\phi$ , where $\phi$ being work function Answer: Option AExplanation:The emitted electrons may lie near the surface and can have a maximum amount of energy E0 If they are from deep inside, then energy is less than E0
