Q. A photo-cell employs photoelectric effect to convert :
A) change in the frequency of light into a change in electric voltage
B) change in the intensity of illumination into a change in photoelectric current
C) change in the intensity of illumination into a change in the work function of the photocathode
D) change in the frequency of light into a change in the electric current
Explanation
[Solution from source] Above the threshold, the photoelectric current is proportional to the intensity of the incident light, so a photocell turns changes in illumination into changes in photocurrent. Frequency changes alter the kinetic energy of the electrons, not the current, and the work function is a fixed property of the cathode. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.