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The work function of substance is 4.0 eV...

The work function of substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

A

`540 nm`

B

`400 nm`

C

`310 nm`

D

`220 nm`

Text Solution

Verified by Experts

The correct Answer is:
C
`W_(0)=4eV, lambda_("max")=?, W_(0)=(hc)/lambda_("max")`
`4eV=1240/lambda_("max") nm-eV [ :' hc=1240 nm-eV]`
`lambda_("max")=310 nm`.
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ALLEN-SIMPLE HARMONIC MOTION-Exercise-04 [B]
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