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The wavelength (in A) of an emission lin...

The wavelength (in A) of an emission line obtained for `Li^(2+)` during an electronic transition form `n_(2)=2` to `n_(1)=1` is

A

`3R//4`

B

`27R//4`

C

`4//3R`

D

`4//27 R`

Text Solution

Verified by Experts

The correct Answer is:
D
`bar(nu) = R((1)/(n_(1)^(2))-(1)/(n_(2)^(2))) Z^(2) = R((1)/(1^(2))-(1)/(2^(2))) xx 3`
`= R[(4-3)/(4)] xx 3^(2) = (27 R)/(4)`
`:. lambda = (1)/(nu) = (4)/(27 R)`
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