An excited hydrogen atom emits a photon of wavelength $\lambda$ in returning to the ground state. The quantum number $n$ of the excited state is ($R=$ Rydberg's constant).
- A$\sqrt{\lambda R(\lambda R-1)}$
- B$\sqrt{\frac{\lambda R}{\lambda R-1}}$
- C$\sqrt{\frac{\lambda R-1}{\lambda R}}$
- D$\sqrt{\frac{1}{\lambda R(\lambda R-1)}}$
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