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The work function for a metal si 4 eV. ...

The work function for a metal si ` 4 eV`. To emit a photoelectron of zero velocity from the surface fo the metal the wavelength of incident light showld be :

A

`2700Å`

B

`1700Å`

C

`5900Å`

D

`3100Å`

Text Solution

Verified by Experts

The correct Answer is:
D
` hv=` "work function" `+ KE `
Given `KE =0` ,
`Thus ` hv = 4e V`
` or ` 4 = ( 12375)/( lambda) ` where `lambda` "is in" `Å`
`thereforelambda = 3100Å`.
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