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Light of wavelength 400nm is incident co...

Light of wavelength 400nm is incident continuously on a Cesium ball. (work function 1.9eV). The maximum potential to which the ball will be charged is

A

3.1V

B

1.2V

C

zero

D

Infinte

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The correct Answer is:
B
(2) `eV_(S)=(hc)/(lambda)-phi=(1240(nm) eV)/(400(nm)) -1.9 eV=1.2 eV`
`rArr V_(S)=1.2 V`
`:.` The cesium ball can be charged to a maximum potential of 1.2 V
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