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An excited state of H atom emits a photo...

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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