The Spectra of Most Stars Are Dark- Line Spectra Because___________

question 28

Multiple Choice

The spectra of most stars are dark- line spectra because___________ .

• A) elements in the earth's atmosphere absorb in these dark- line bands, blocking out the frequencies in the dark bands
• B) electrons decaying to a lower energy state emit a photon at a fixed energy, leaving dark bands between the emissions
• C) elements in the Sun's outer atmosphere emit radiation between these dark bands
• D) elements in the Sun's outer atmosphere absorb in these dark- line bands, blocking the radiation in those bands

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