The interstellar medium and how does it becomes enriched over time with heavy elements.

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Chapter 8, Problem 3Q

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The interstellar medium and how does it becomes enriched over time with heavy elements.

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What evidence can you cite that the interstellar medium contains both gas and dust? (Select all that apply.) (1)The dust of the interstellar medium can be detected from the emission lines of elements heavier than iron. (2)The dust of the interstellar medium can be detected by the extinction of light from distant stars. (3)The dust of the interstellar medium can be detected by the scattering of blue light from distant or embedded objects. (4)The gas of the interstellar medium can be detected from the radiation of ultraviolet photons. (5)The gas of the interstellar medium can be detected from the radiation of photons of wavelength 21 cm. (6)The gas of the interstellar medium can be detected from the absorption lines present in the light from distant stars, which must be caused by a medium of a density and temperature other than that of the stars emitting the light.

Absorption lines produced by interstellar gas a. are wider than the lines from stars because the gas is hotter than most stars. b. are more narrow than the lines from stars because the gas has a lower pressure than stars. c. indicate that the interstellar medium contains dust. d. indicate that the interstellar medium is expanding away from the sun. e. indicate nothing; none of the above statements are true.

Based on what you know about observations of the interstellar medium at wavelengths other than for visible light, select all of the correct statements from the following list. -The 21-cm radio observations are of neutral hydrogen. -Much interstellar dust between stars is not visible. -The source of hot gas observed at X-ray wavelengths is not known. -All interstellar material is cool. -Interstellar dust is observed at ultraviolet wavelengths. -Giant molecular clouds consist mostly of CO molecules. -Material observed at wavelengths longer than that of visible light is usually cool.