question_answer

When a certain photosensitive surface is illuminated with monochromatic light of frequency u, the stopping potential for the photo current isWhen the surface is illuminated by monochromatic light of frequencythe stopping potential is The threshold frequency for photoelectric emission is- [JEE Main 12-Jan-2019 Evening]

A)

B)

C)

D)

Correct Answer: D

Solution :

[d] Einstein’s photoelectric equation in the two cases is given by

...(i)

and                      (ii)

From eqn. (i) and (ii),