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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

`3.2 xx 10^(-21) J`

B

`3.2 xx 10^(-19)` J

C

`7 xx 10^(-25)` J

D

`3 xx 10^(-19)` J

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The correct Answer is:
B
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