Ultraviolet radiation of 6.2 eV falls o...

Ultraviolet radiation of 6.2 eV falls on an aluminium surface (work - function = 4.2 eV). The kinetic energy in joule of the fastest electrons emitted is

A

`3xx10^-21`

B

`8xx10^-19`

C

`4xx10^-17`

D

`3xx10^-15`

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The correct Answer is:

B

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