When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased fro m emitted 0.5 eV to 0.8eV. The work function of the metal is:
(A) 0.65 eV
(B) 1.0 eV
(C) 1.3 eV
(D) 1.5 eV
