 The figure shows the hydrogen spectral series. The series whose lines all lie in the **visible** region and correspond to transitions ending at $n = 2$ is:
APaschen series
BBalmer series
CLyman series
DBrackett series
Answer & Solution
Correct answer: B. Balmer series
**Mnemonic for hydrogen spectral series**:
| Series | Final $n$ | Region |
|---|---|---|
| Lyman | 1 | Ultraviolet |
| **Balmer** | **2** | **Visible** |
| Paschen | 3 | Infrared |
| Brackett | 4 | Far IR |
| Pfund | 5 | Far IR |
The Balmer series is the only one fully in the visible spectrum — and it's how we first "saw" quantum mechanics, before we knew what to call it.
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