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A hot thin gas seen with no bright source behind it shows bright:
AExtraction lines
BEmission lines
CExtension lines
DExpansion lines
Answer & Solution
Correct answer: B. Emission lines
1. Excited atoms give back light at particular wavelengths.
2. Only those wavelengths appear.
3. They are emission lines.
_Source: OpenStax Astronomy 2e, Chapter 5, Radiation and Spectra._
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