Number of possible spectral lines in the Brackett series of H-spectrum, when present in the excited state returns to the ground state, is

Question

Number of possible spectral lines in the Brackett series of H-spectrum, when  present in the  excited state returns to the ground state, is

Canvas Classes · Accepted Answer

Step 1: Identify the orbit

excited state means  (ground state is , first excited = , ..., 9th excited = ).

Step 2: Brackett series definition

Brackett series: transitions ending at .

So  can be  (all values from 5 to 10).

Step 3: Count lines

Number of Brackett lines =

(Transitions: , , , , , )

Final Answer: 6 → Option (d)

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