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The work functio of a substance is 4.0 ...

The work functio of a substance is ` 4.0 eV`. The longest wavelength of light that can cause photoelectron emission form this substance is approximately :

A

` 540 nm`

B

` 400nm`

C

`310 nm`

D

`220 nm`

Text Solution

Verified by Experts

The correct Answer is:
C
` lambda_(max) = (hc)/W`
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