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Ultraviolet radiation of 9.2 eV falls on...

Ultraviolet radiation of 9.2 eV falls on an aluminium suface of work function 4.2 eV. The kinetic energy, in joule, of the fastest electron emitted is approximately

A

`3.2 xx10^-21`

B

`3.2xx10^-19`

C

`3.2xx10^-17`

D

`3.2xx10^-15`

Text Solution

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The correct Answer is:
B
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