A) wavelength of the incident light
B) frequency of the incident light
C) velocity of the incident light
D) atomic mass of an element
Correct Answer: B
Solution :
In photoelectric effect, photoelectrons are emitted only when light of frequency higher than the threshold frequency falls at the surface of the metal. The excess energy (excess to that of threshold energy) gives the kinetic energy to the electron. Thus, kinetic energy of photoelectron increases linearly with the frequency of incident light.
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