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X-rays are used to irradiate sodium and ...

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

A

equal in both cases

B

greater for sodium

C

greater for copper

D

infinite in both cases

Text Solution

Verified by Experts

The correct Answer is:
B
`eV_s = hv - W_0` : as work function `W_0` is less for sodium than for copper , hence the value of stopping potential `V_s` is more for sodium than for copper .
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