Find the wavelength of light emitted when an electron drops from `n=3` level to ground state in `He^(+)` ion Given Rydberg constant `=10^(7)m^(-1)`

Explanation

`bar(upsilon)=(1)/(lamda)=Z^(2)R_(H)[(1)/(n_(1)^(2))-(1)/(n_(2)^(2))]implies bar(upsilon)=(2)^(2).(10^(7)).[(1)/(1)-(1)/(9)]implies bar(upsilon)=4xx10^(7)[(8)/(9)]`
`implies lambda = (9)/(32)xx10^(-7)m=0.2813xx10^(-7)m=281.3Å`