Question

If an electron drops from $n=4$ to $n=2$ in a hydrogen atom, the series of spectral lines observed is:

• A. Lyman series
• B. Balmer series
• C. Paschen series
• D. Brackett series

Hint:

Balmer series is the only series in the Hydrogen spectrum that falls in the visible region.

Answer 1

The Correct Option is B

Step 1: Concept
Spectral series are named based on the lower energy level ($n_{f}$) the electron drops to.
Step 2: Analysis
Lyman ($n_{f}=1$), Balmer ($n_{f}=2$), Paschen ($n_{f}=3$), etc.
Step 3: Conclusion
Since the transition ends at $n=2$, it belongs to the Balmer series.
Final Answer: (B)