Calculate the wave number of the first spectral line in the lyman series of `He^(+)` spectrum. 

Explanation

For first line in Lyman series, `n_(1) =` lower energy `= 1 n_(2) =` higher energy = 2. Atomic number `z: 4`.
Wave number `=bar(upsilon)=Z^(2)R_(H)((1)/(1^(2))-(1)/(2^(2)))=4xx109677xx(3)/(4)=329031cm^(-1)`
Wave number of first line in Lyman series of `He^(+)` is `3.29xx10^(5)cm^(-1)`