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The wavelength of an electron for transition from a state $n_{1}$ to $n_{2}$ is $\frac{9}{8 R}$. Which of the following wavelengths is possible for a transition from $\mathrm{n}_{2}$ to $\mathrm{n}_{1}$
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The correct answer is:
$\frac{9}{8 \mathrm{R}}$
Energy released in transition from state $\mathrm{n}_{1}$ to $\mathrm{n}_{2}$ is equal to the energy absorbed in transistion from state $\mathrm{n}_{2}$ to $\mathrm{n}_{1}$.
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