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# The number of degenerate orbitals in an energy level of H-atom having En= -RH/9, where RH is Rydberg and 1 RH = 2.18 x 10–18 J isa)5b)9c)6d)3Correct answer is option 'B'. Can you explain this answer? Related Test: Atomic Structure (Chapter Test - Medical)

## Class 12 Question

By Kush · Jul 06, 2020 ·Class 12
Syed Mehmood answered Nov 21, 2018
E=-2.18*10^-18(Z/n)^2
So energy is -Rh/9=-2.18*10^-18/9
z=1 for H
solving we get n=3
degenerate orbital means orbital having same energy.
Now subshell in shell 3 are 3s 3p 3d.
so total orbital is:
s=1
p=3
d=5
total=9

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