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The work function of a substance is 4.0 ...

The work function of a 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
`lambda` (in Å)`=(12375)/(W(eV))=12375/4.0 Å~~3093 Å`
`implies lambda~~309.3 nmimplies lambda=310 nm`
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