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If ultraviolet radiation of 6.2 eV falls...

If ultraviolet radiation of 6.2 eV falls of an aluminium surface , then kinetic energy of the fastest emitted electrons is (work function = 4.2 e V)

A

`3.2 xx 10^(-19) J`

B

`3.2 xx 10^(-21) J`

C

`7 xx 10^(-25) J`

D

`9 xx 10^(-31) J`

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The correct Answer is:
A
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