Define  threshold frequency?

For a given Photosensitive material, there is a certain minimum cut off frequency called Threshold frequency, for which stopping potential is zero.

Higher the work function of the material, greater is the Threshold frequency. (As you are aware that stopping potential is the minimum value of potential below which photoelectric current becomes 0.

See the figure below of two different metals having different Threshold Frequency.

 

 

 

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