The wave number of the first line in the Balmer series of H-atom is `15200cm^(-1)`. Calculate the wave number of the first line in the same series of `Li^(2+)` ion.

Explanation

In the case of Balmer series,
`overline(v)_(H)=R_(H)((1)/(2^(2))-(1)/(n^(2)))=15200cm^(-1)`
`overline(v)_(Li^(3+))=overline(v)_(H)xxz^(2)=15200xx3^(2)=136800cm^(-1)`.