Which of the following correctly defines the threshold frequency in photoelectric emission?
AThe frequency at which photoelectric current is maximum
BThe minimum frequency of incident radiation required for emission of photoelectrons
CThe frequency corresponding to saturation current
DThe frequency at which stopping potential becomes zero for all metals
Answer & Solution
Correct answer: B. The minimum frequency of incident radiation required for emission of photoelectrons
Threshold frequency $\nu_0$ is the minimum frequency needed to eject electrons from a given metal. Below this value, no photoelectric emission occurs regardless of intensity.
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