The angular momentum of an electron in a Bohr's orbit of ${\mathrm{He}}^{+}\mathrm{is}3.1652\times {10}^{-34}\mathrm{kg}-{\mathrm{m}}^2/\sec .$ What is the wave number in terms of Rydberg constant (R) of the spectral line emitted when an electron falls from this level to the first excited state.  $\left[\mathrm{Use}\mathrm{h}=6.626\times {10}^{-34}\mathrm{Js}\right]$