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

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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  

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(b) third orbit 

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