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Light from a hydrogen discharge tube is ...

Light from a hydrogen discharge tube is incident on the cathode of a photocell. The work function of cathode surface is 4.2 eV. In order to reduce the photocurrent 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`

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The correct Answer is:
B
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