Hydrogen atom from excited state comes to the ground state by emitting a photon of wavelength $\lambda$. The value of principal quantum number '$n$' of the excited state will be : ($\mathrm{R}:$ Rydberg constant)

Question

$\sqrt{\frac{\lambda \mathrm{R}}{\lambda-1}}$

$\sqrt{\frac{\lambda \mathrm{R}}{\lambda \mathrm{R}-1}}$

$\sqrt{\frac{\lambda}{\lambda \mathrm{R}-1}}$

$\sqrt{\frac{\lambda R^{2}}{\lambda R-1}}$

Solution

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