The Spectra of Most Stars Are Dark-Line Spectra Because ________

question 60

Multiple Choice

The spectra of most stars are dark-line spectra because ________.

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

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