Q.

An excited hydrogen atom emits a photon of wavelength 'λ' in returning to the ground state. If 'R' is the Rydberg's constant, then the quantum number 'n' of the excited state is - 

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a

λRλR-1

b

λR-1

c

λRλR-1

d

λR

answer is C.

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Detailed Solution

1λ=R×112-1n2 1=1-1n2 1n2=1-1λR=λR-1λR n=λRλR-1   

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