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The work function of a metal is 4.2 eV. ...

The work function of a metal is `4.2 eV`. If radiation of `2000 Å` fall on the metal then the kinetic energy of the fastest photoelectron is

A

`1.6xx10^(-19)J`

B

`1.6xx10^(10)J`

C

`3.2xx10^(-19)J`

D

`6.4xx10^(-10)J`

Text Solution

Verified by Experts

The correct Answer is:
C
Use `K.E_("max")=hv-W_(0)" "K.E_("max")" (in ev)"=(12400)/(2000)-4.2`
`=2eV=2xx1.6xx10^(-19)=3.2xx10^(-19)J`
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