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Find out the degeneracy of hydrogen atom...

Find out the degeneracy of hydrogen atom that has the erngy equal to ` - (R_H)/9` (`R_H` = Rydberg costant ).

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The correct Answer is:
9
Energy in H-atom ` - (R_H)/n^2 =- (R_H)/9`
` :. N=3`

degeneracy ` = 1+3 +5=9` .
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