question_answer

The light rays having photons of energy 1.8 eV are falling on a metal surface having a work function 1.2 eV. What is the stopping potential to be applied to stop the emitting electrons                                  [BHU 2005]

A)            3 eV                                         

B)            1.2 eV

C)            0.6 eV                                     

D)            1.4 eV