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Ultraviolet radiation of 6.2 eV falls on...

Ultraviolet radiation of 6.2 eV falls on a metallic surface. If the work function of the metal is 4.2 eV, then the kinetic energy of the fasted electron ejected from the surface is

A

`1.6xx10^(-19)` J

B

`3.2xx10^(-19)J`

C

`3.2xx10^(-25)`J

D

`1.6xx10^(-18)J`

Text Solution

Verified by Experts

The correct Answer is:
B
Max `K.E.=hv-W_(0)=6.2-4.2=2eV`
`=2xx1.6xx10^(-19)=3.2xx10^(-19)J`
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MARVEL PUBLICATION-ELECTRONS AND PHOTONS -TEST YOUR GRASP - 17
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