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UV radiations of 6.2 eV fall on an alumi...

UV radiations of 6.2 eV fall on an aluminium surface whose work function is 4.2 eV. The kinetic energy of the fastest electron emitted by the sluminium surface will be

A

`3.2xx10^(-19)J`

B

`3.2xx10^(-21)J`

C

`3.2xx10^(-17)J`

D

`3.2xx10^(-34)J`.

Text Solution

Verified by Experts

The correct Answer is:
A
`K_(max)=E-phi_(0)=(6.2-4.2)eV=2.0eV=2.0xx1.6xx10^(-19)J=3.2xx10^(-19)J`
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