Consider the spectral line resulting from the transition from $\mathrm{n}=2$ to $\mathrm{n}=1$, in a

Question

Consider the spectral line resulting from the transition from $\mathrm{n}=2$ to $\mathrm{n}=1$, in atoms and ions given below. The longest wavelength is produced by\

Professor PC Thomas Classes · Answer

$\frac{1}{\lambda}=\mathrm{Z}^{2} \mathrm{R}\left(\frac{1}{1^{2}}-\frac{1}{2^{2}}ight)$ For longest $\lambda, \mathrm{Z}$ should be smallest\ $	herefore$ For shortest $\lambda$, hydrogen is needed.\