A certain electronic transition from an excited state to the ground state of the H atom in one or mo — Atomic Structure Chemistry Question
Question
A certain electronic transition from an excited state to the ground state of the H atom in one or more steps gives rise to exactly four lines in the ultraviolet region of the spectrum. How many lines does this transition produce in the infrared region?
Answer: C
💡 Solution & Explanation
UV lines belong to the Lyman series (ending at $n=1$). If 4 Lyman lines are produced, transitions occur from $n=5$ down to $n=1$. Infrared lines correspond to Paschen (ending at 3) and Brackett (ending at 4). From $n=5$, possible IR lines are $5\to4$, $5\to3$, and $4\to3$. Total = 3 lines.
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