#### Question

Define (i) stopping potential and (ii) threshold frequency, using Einstein’s equation and drawing necessary plot between relevant quantities.

#### Solution

**Stopping potential**: For a particular frequency of incident radiation, the minimum negative (retarding) potential V_{0} for which the photocurrent stops or becomes zero is called the cut-off or stopping potential.

**Threshold frequency**: The minimum frequency required for photoelectrons to be emitted from a metal surface is called the threshold frequency.

The graph between stopping potential and frequency of incident radiation is shown below:

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Solution Define Stopping Potential and Threshold Frequency, Using Einstein’S Equation and Drawing Necessary Plot Between Relevant Quantities. Concept: Einstein’s Equation - Particle Nature of Light.