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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 photo electron emission from this substance is approximately. (a) `540 nm` (b ) `400nm` (c ) `310 nm` (d) `220 nm`

A

`540 nm`

B

`400 nm`

C

`310 nm`

D

`220 nm`

Text Solution

Verified by Experts

The correct Answer is:
C
`lambda_(0) = (hc)/(W_(0)) = (12400)/(4) = 3100 Å = 310 nm`
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