X-rays are used to irradiate sodium and copper surfaces in two separate experiments and stopping potential 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 C Greater for sodium.
Photo-Electric Effect
$V_{s} e = h v - W_{o}$
As $W_{o}$ decreases, $V_{s}$ increases
For copper, $W = 4.7 e V$
for Sodium, $W = 2.28 e V$
Hence, $V_{s}$ is higher for sodium.

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