Find the wavenumber corresponding to the longest wavelength photon to remove electron from the second excited state of `He^(o+) "ion" (R= 1.097 xx 10^(7)m^(-1))`

Explanation

Second excited state `-=n = 3`
Longest wavelength photon refers to transition `n = 3 to 4`
`bar v = RZ^(2)[(1)/(3^(2)) - (1)/(4^(2))]`
`= 1.097 xx 10^(7)(4)[(1)/(9) - (1)/(16)]m^(-1)`
`= 2.133 xx 10^(6)m^(-1)`