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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Definitions:

Intestines

The lower part of the digestive system, divided into the small and large intestines, that processes nutrients from food and excretes waste.

Maturation

The process of becoming mature, involving growth and development to reach a stable or more advanced state.

Thymus

An immune system gland located in the chest that produces T-cells for the adaptive immune system before birth and during childhood.

Lymphocytes

White blood cells that are fundamental in the immune system to fight infection and disease.