Chapter 4, Problem 35P

To determine

Compare the Balmer series of hydrogen with the series where $n_l=4$ for the ionized helium atom $H{e}^{+}$ . The difference between the wavelengths of $L_{\alpha }$ and $L_{\beta }$ line of hydrogen and difference between the $n_u=6$ and $8$ of helium $H{e}^{+}$. Whether there is a wavelength of the Balmer series that is very similar to any wavelength values where $n_l=4$ in $H{e}^{+}$.