An excited state of H atom emits a photon of wavelength `lamda` and returns in the ground state. The principal quantum number of excited state is given by:
A
`sqrt(lamdaR(lamdaR-1))`
B
`sqrt((lamdaR)/((lamdaR-1))`
C
`sqrt(lamdaR(lamdaR-1)`
D
`sqrt((lamdaR-1)/((lamdaR))`
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