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Hydrogen atom from excited state comes t...

Hydrogen atom from excited state comes to the ground state by emitting a photon of wavelength `lambda`. If R is the Rydberg constant, then the principal quatum number n of the excited state is

A

`[(lambdaR)/(lambdaR-1)]^(1//2)`

B

`[(lambdaR+1)/(lambdaR)]^(1//2)`

C

`[lambdaR(lambdaR+1)]^(1//2)`

D

`[(1)/(lambdaR(lambdaR+1))]^(1//2)`

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The correct Answer is:
A
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