Q. The ratio of the wavelengths for $2 \rightarrow 1$ transition on $Li^{+ +},\ He^{+}$ and $H$ is

A) 1 : 2 : 3
B) 1 : 4 : 9
C) 4 : 9 : 36
D) 3 : 2 : 1
Explanation

(c) $\frac{1}{\lambda} = RZ^{2}\left( \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}}\ \right) \Rightarrow \lambda \propto \frac{1}{Z^{2}}$
$\lambda_{Li^{+ +}}:\lambda_{He^{+}}:\lambda_{H} = 4:9:36$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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