A photon of energy hv is absorbed by a free electron of a metal having work function ϕ < hv
(A) The electron is sure to come out
(B) The electron is sure to come out with a kinetic energy hv- ϕ
(C) Either the electron does not come out or it comes out with a kinetic energy hv- ϕ
(D) It may come out with a kinetic energy less than hv - ϕ
