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Question

What is the degeneracy of the hydrogen atom energy level that has the energy (RH9)?
(Where RH is Rydberg energy constant)

A
8
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B
6
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C
9
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D
5
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Solution

The correct option is C 9
We know,
En=RHn2=RH9
n=3

Since n=3, there are 3 subshells, but, for H like systems, for any energy level n, the degeneracy is given by n2

So the degeneracy of the energy level will be n2=32=9

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