# NEET Physics Nuclei Questions Solved

Hydrogen (H), deuterium (D), singly ionized helium and doubly ionized lithium all have one electron around the nucleus. Consider n =2 to n = 1 transition. The wavelengths of emitted radiations are ${\mathrm{\lambda }}_{1},{\mathrm{\lambda }}_{2},{\mathrm{\lambda }}_{3}$ and ${\mathrm{\lambda }}_{4}$ respectively. Then approximately
(a) ${\mathrm{\lambda }}_{1}={\mathrm{\lambda }}_{2}=4{\mathrm{\lambda }}_{3}=9{\mathrm{\lambda }}_{4}$                             (b) $4{\mathrm{\lambda }}_{1}=2{\mathrm{\lambda }}_{2}=2{\mathrm{\lambda }}_{3}={\mathrm{\lambda }}_{4}$
(c) ${\mathrm{\lambda }}_{1}=2{\mathrm{\lambda }}_{2}=2\sqrt{2}{\mathrm{\lambda }}_{3}=3\sqrt{2}{\mathrm{\lambda }}_{4}$                 (d) ${\mathrm{\lambda }}_{1}={\mathrm{\lambda }}_{2}=2{\mathrm{\lambda }}_{3}=3\sqrt{2}{\mathrm{\lambda }}_{4}$