question_answer

The work functions of the metals A and B are in the ratio 1 : 2. If the light of frequencies f and 2f are incident on metal surfaces of A and B respectively. The ratio of maximum kinetic energy of photo electrons emitted is [f is greater than threshold frequency of A. If is greater than threshold frequency of B]:

A)  1 : 1                                      

B)  1 : 2

C)   1 : 3                                     

D)  1 : 4