question_answer

The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows:            [JEE MAIN 2013]

A)

B)  

C)

D)

Correct Answer: D

Solution :

[d] Aswill increase will decrease so current should decrease and finally fall to zero whenis achieved.