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When a surface is irradiated with light of wavelength `4950 Å`, a photocurrent appears which vanishes if a retarding potential greater than 0.6 volt is applied across the phototube. When a second source of light is used, it is found that the critical potential is changed to 1.1 volt.
The work- function of the emitting surface is i

A

9.1 eV

B

1.9 eV

C

0.9 eV

D

0.6 eV

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The correct Answer is:
B
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