A) Wavelength
B) frequency
C) amplitude
D) angle of incidence
Correct Answer: B
Solution :
In photoelectric effect for a given photosensitive material, there exists a certain minimum cut-off frequency, called the threshold frequency, below which no emission of photoelectrons takes place no matter how intense the light is. Note: The photoelectric emission is an instantaneous process without any apparent time lag \[(\sim {{10}^{-9}}S)\] even when the incident radiation is made exceedingly dim.
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