Which spectral series of hydrogen lies in the visible region of the electromagnetic spectrum?
APaschen
BPfund
CLyman
DBalmer
Answer & Solution
Correct answer: D. Balmer
Balmer (transitions to $n=2$) covers wavelengths roughly $364\,\text{nm}$ to $656\,\text{nm}$ — the visible band. Lyman is UV (transitions to $n=1$), Paschen and Pfund are infrared (to $n=3$ and $n=5$).
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