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Find out the degeneracy of hydrogen atom that has the energy equal to $-\large\frac{R_H}{9}$.($R_H$-Rydberg constant).


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Energy in H-atom =$-\large\frac{R_H}{n^2}=\large\frac{R_H}{9}$
$\Rightarrow n^2=9$
$\Rightarrow n=3$
One orbital,three orbital,five orbital
$\therefore$ degeneracy =1+3+5=9
Hence (b) is the correct answer.
answered Jan 17, 2014 by sreemathi.v

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