Q. Photoelectric emission occurs only when the incident light has more than a certain minimum
A) Frequency
B) Power
C) Wavelength
D) Intensity
Explanation
[Solution from source] Photoelectric emission requires the frequency to exceed the threshold frequency of the metal, whatever the intensity. Intensity or power only changes the number of electrons once emission occurs; a minimum wavelength is the wrong sense since there is a maximum wavelength. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.