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Sodium and copper have work functions 2....

Sodium and copper have work functions 2.3eV and 4.5 eV. Then ratio of their 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
`W_(0)=(hc)/(lambda_(0))`
`:.((lambda_(0))_(1))/((lambda_(0))_(2))=((W_(0))_(2))/((W_(0))_(1))=(4*5)/(2*3)~~2:1`
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