. In photoclectric effect, the electrons are ejected from metals if the incident light has a certain minimum :

(a) wave length      

(b)  frequency

(c)  amplitude   

(d)  angle if incidence


Best Answer

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 (~10-9 s) even when the incident radiation is made exceedingly dim.


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