Which of the following series of hydrogen falls in the infrared region?

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Which of the following series of hydrogen falls in the infrared region? Answer: Pfund

The Pfund series of hydrogen occurs when electrons fall to the 𝑛=5 n=5 energy level. These transitions produce lines in the infrared region.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.