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For the transition from n=2 to n=1 ,...

For the transition from `n=2 to n=1` , which of the following will produce shortest wavelength ?

A

`Li^(2+)`

B

`He^(+)`

C

H

D

`H^(+)`

Text Solution

Verified by Experts

The correct Answer is:
A
`(1)/(lambda) = Z^(2)R_(H)[(1)/(n_(1)^(2))-(1)/(n_(2)^(2))], n_(1) = 1, n_(2) = 2`
`:. (1)/(lambda) =Z^(2) R_(H)[(1)/(1)-(1)/(4)] = (3)/(4)Z^(2) R_(H)`
or `lambda prop (1)/(Z^(2)) :. Li^(2+)` will produce shortest wave length.
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