X-rays are used to irradiate sodium and copper surfaces in two separate experiments and stopping potentials are determined. The stopping potential is

Equal in both cases

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Greater for sodium

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Greater for copper

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Infinite in both cases

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Solution

The correct option is B Greater for sodium
The frequency of the X ray is same in both the cases. The work function of $N a$ is $2.28 e V$ while for $C u$ is $4.7 e V$ . Hence, the work function of sodium is less than that of copper. Therefore, the stopping potential of $N a$ is greater than that of $C u$ .

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