What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition `n=4` to `n=2` of `He^(+)` spectrum ?

Options

A. `n_(1) = 1, n_(2) = 2`
B. `n_(1) = 2, n_(2) = 3`
C. `n_(1) = 3, n_(2) = 2`
D. `n_(1) =2, n_(2) = 4`

Answer

A

Explanation

`R xx Z^(2) [(1)/(n_(1)^(2))-(1)/(n_(2)^(2))] = R [(1)/(n_(1)^(2))-(1)/(n_(2)^(2))]`