Physics
NULL
Medium
Question
Which of the following is true ?
A
Lyman series is a continuous spectrum.
B
Paschen series is a line spectrum in the infra red.
✓ Official correct answer
C
Balmer series is a line spectrum in the ultraviolet.
D
the spectral series formula can be derived from the Rutherford model of the hydrogen atom.
Community credibility
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A
Lyman series is a continuous spectrum.
No member explanations yet for this option.
B
Paschen series is a line spectrum in the infra red.
No member explanations yet for this option.
C
Balmer series is a line spectrum in the ultraviolet.
No member explanations yet for this option.
D
the spectral series formula can be derived from the Rutherford model of the hydrogen atom.
No member explanations yet for this option.
Explanation
The Paschen series (transitions ending at n=3) is a line spectrum in the infrared region -- the only true statement among the four, since Lyman is a line (not continuous) spectrum, Balmer lies in the visible (not ultraviolet) range, and spectral series formulas were derived from Bohr's quantized model, not Rutherford's classical model.
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