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Explain 'stopping potential' and 'thresh...

Explain 'stopping potential' and 'threshold frequency' in photoelectric emission.Give an appropriate graph.

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Cut off potential or Stopping potential :
Stopping potential : The value of minimum negative potential applied to a plate at which photoelectric current becomes zero is known as stopping potential.
Threshold Frequency : A minimum frequency, below which there is no photoelectric emission, is known as threshold frequency.
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