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Sodium and copper have work functions of...

Sodium and copper have work functions of 2.3eV and 4.5 eV respectively, then the ratio of the wavelengths is nearest to

A

`1 : 2`

B

`4 : 1`

C

`2 : 1`

D

`1 : 4`

Text Solution

Verified by Experts

The correct Answer is:
C
`(lambda_(0) (Na))/(lambda_(0) (Cu)) = (W_(0) (Cu))/(W_(0)(Na)) = (4.5)/(2.3) ~~ 2 : 1`
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