Define threshold frequency and cut-off potential
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Threshold frequency is defined as the minimum frequency of incident light which can cause photo electric emission i.e. this frequency is just able to eject electrons with out giving them additional energy.
The negative potential of the plate 'C' at which the photo electric current becomes zero is called stopping potential or cut-off potential. Stopping potential is that value of retarding potential difference between two plates which is just sufficient to halt the most energetic photo electrons emitted.
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For a given surface, the emission of photoelectrons takes place only if the frequency of incident light is greater than a certain minimum frequency called the Threshold frequency.
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