1.

Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be                  [MP PET 2001]

A.            0 eV                                         
B.            1 eV
C.            2 eV                                         
D.            10 eV
Answer» B.            1 eV


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