The Spectra of Most Stars Are Dark- Line Spectra Because___________

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