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What is the wave number of photon emitted during transition from orbit, $\mathrm{n}=4$ to $\mathrm{n}=2$ in hydrogen atom $\left[\mathrm{R}_{\mathrm{H}}=109677 \mathrm{~cm}^{-1}\right]$
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$20564.44 \mathrm{~cm}^{-1}$
$\begin{aligned} \bar{v} & =109677\left[\frac{1}{2^2}-\frac{1}{4^2}\right] \mathrm{cm}^{-1} \\ & =109677\left[\frac{1}{4}-\frac{1}{16}\right] \mathrm{cm}^{-1} \\ & =109677\left[\frac{12}{64}\right] \mathrm{cm}^{-1} \\ & =20564.44 \mathrm{~cm}^{-1}\end{aligned}$
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