Hydrogen $(H)$, deuterium $(D)$, singly ionized helium $(He^+)$ and doubly ionized lithium $(Li^{++})$ all have one electron around the nucleus. Consider $n = 2$ to $n = 1$ transition. The wavelengths of emitted radiations are $\lambda_1, \lambda_2 \lambda_3$ and $\lambda_4$ respectively.
Hydrogen $(H)$, deuterium $(D)$, singly ionized helium $(He^+)$ and doubly ionized lithium $(Li^{++})$ all have one electron around the nucleus. Consider $n = 2$ to $n = 1$ transition. The wavelengths of emitted radiations are $\lambda_1, \lambda_2 \lambda_3$ and $\lambda_4$ respectively.
- A
$\lambda_1 = \lambda_2 = 4 \lambda_3 = 9 \lambda_4$
- B
$4 \lambda_1 = 2 \lambda_2 = 2 \lambda_3 = \lambda_4$
- C
$\lambda_1 = 2 \lambda_2 = 2 \sqrt 2 \lambda_3 = 3 \sqrt 2 \lambda_4$
- D
$\lambda_1 = \lambda_2 = 2 \lambda_3 = 3 \sqrt 2 \lambda_4$
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- [AIIMS 1999]