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Q. Photoelectric emission occurs only when the incident light has more than a certain minimum

AIPMTAIPMT 2011Dual Nature of Radiation and Matter

Solution:

According to Einstein's photoelectric equation
$ K _{\max }= hv - hv _{0} $
Since $K _{\max }$ is positive, the photoelectric emission occurs only if
$ h v>\text { hv }_{0} \text { or } v>v_{0} $
The photoelectric emission occurs only when the incident light has more than a certain minimum frequency. This minimum frequency is called threshold frequency.