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Light from a hydrogen tube is incident o...

Light from a hydrogen tube is incident on the cathode of a photoelectric cell the work function of the cathode surface is `4.2 eV`. In order to reduce the photo - current to zero the voltage of the anode relative to the cathode must be made

A

`-4.2` V

B

`-9.4` V

C

`-17.8` V

D

`+9.4` V

Text Solution

Verified by Experts

The correct Answer is:
B
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