Q. 103.9( 69 Votes )

A photon beam of energy 12.1eV is incident on a hydrogen atom. The orbit to which electron of H-atom be excited is
A. 2nd

B. 3rd

C. 4th

D. 5th

Answer :

Emission of photon of 12.1eV corresponds to the transition from n=3 to n=1.

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