question_answer

Stopping potential required to reduce the photoelectric current to zero

A)  is directly proportional to the wavelength of the incident radiation

B)  increases uniformly with wavelength of the incident radiation

C)  is directly proportional to the frequency of the incident radiation

D)  decreases uniformly with the frequency of the incident radiation

Correct Answer: C

Solution :

The negative potential at which photoelectric current becomes zero is called stopping potential. If at the stopping potential light of n frequency higher than before be made to fall on plate, then photoelectric current is re-established. On increasing the negative potential of other plate, the current again stops. Hence, higher the frequency of the incident light, higher will be the maximum kinetic energy of the emitted photoelectrons or higher will be the stopping potential.