Question

Which of the following increases the maximum kinetic energy of the photoelectrons emitted?

(a) Increasing the frequency of the incident beam

(b) Increasing the velocity of the electrons

(c) Decreasing the frequency of the incident beam

(d) Increasing the mass of the photoelectrons

I got this question during an internship interview.

My question is from Experimental Study of Photoelectric Effect in portion Dual Nature of Radiation and Matter of Physics – Class 12

Answer 1

Correct choice is (a) Increasing the frequency of the incident beam

Easy explanation: The maximum kinetic energy of the photoelectrons can be increased by increasing the frequency of the incident beam and at the same time keeping the number of incident photons fixed. Now, this would result in a proportionate increase in energy, and in this way, the maximum kinetic energy can be increased.