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Which series of the hydrogen spectrum lies entirely in the *visible* region?

APaschen
BBalmer
CLyman
DPfund
Answer & Solution
Correct answer: B. Balmer
**Balmer:** transitions to $n=2$, wavelengths 364–656 nm — the visible band. Lyman → UV ($n=1$). Paschen, Brackett, Pfund → IR ($n=3, 4, 5$).
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