A photon beam of energy 12.1eV is incident on a hydrogen atom. the orbit to which electron of h-atom be excited is
2nd, 3nd,4th,5th
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Answer. Explanation: The emission of photon of 12.1eV shall correspond to the transition from n = 3 to n =1. Therefore, the orbit to which electron of H-atom be excited is 3rd.
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