Hydrogen atom from excited state comes to the ground state by emitting a photon of wavelength λ. If R is the Rydberg constant, the principal quantum number 'n' of the excited state is
1
\(\sqrt{\frac{\lambda }{\lambda R-1}}\)
2
\(\sqrt{\frac{\lambda {{R}^{2}}}{\lambda R-1}}\)
3
\(\sqrt{\frac{\lambda R}{\lambda -1}}\)
4
\(\sqrt{\frac{\lambda R}{\lambda R-1}}\)