Verified Solution • 2025–26 Session moderate

QPages 382-383: Q5: HC Verma: Concepts of Physics - Volume 2 Bohr's Model and Physics of the Atom Pages 382-383: Q5 Solution: Balmer series was observed and analysed before the other…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the Balmer series was analysed first because it involves the lowest excited level (n=2) or has the simplest formula, ignoring that its lines lie in the visible spectrum, which can be seen with simple spectroscopes. Remember to base historical‑order arguments on experimental detectability (visible vs UV/IR), not on abstract quantum numbers alone.

Balmer series was observed and analysed before the other series. Can you suggest a reason for such an order?

Step-by-Step Verified Solution

**Answer:** Because the Balmer series lies in the visible region, making it easier to observe with simple spectroscopes. **Step-by-Step Explanation:** The Balmer series (transitions to n = 2) has wavelengths in the visible range (400�700 nm), which can be detected with simple optical instruments and even the naked eye. The Lyman series is in the ultraviolet, and the Paschen and higher series are in the infrared, requiring special detectors. Hence, Balmer series was discovered and analysed first [citation:14].

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