Chapter 9 (The Formation & Structure of Stars) Quiz

Chapter 9 (The Formation & Structure of Stars) Quiz...

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1. Which of the following is evidence that the space between the stars is not totally empty? a. The interstellar extinction of starlight. b. The presence of absorption lines of singly-ionized calcium in the spectra of hot stars. c. Absorption lines in stellar spectra that are much thinner than the other spectral lines. d. Some stars appearing redder than they should based on their spectral types. e. All of the above. 2. What type of spectra are obtained from a reflection nebula? a. Continuous spectra. b. Absorption line spectra. c. Emission line spectra. d. Both a and b above. e. All of the above. 3. How do interstellar absorption lines differ from stellar absorption lines? a. Interstellar absorption lines are broader. b. Interstellar absorption lines are narrower. c. Interstellar absorption lines are all hydrogen lines. d. Both a and c above. e. None of the above. 4. Hot emission nebulae are somewhat red, and cool reflection nebulae are blue. Why are these colors different from what Wien's law tells us about the radiation emitted by a black body? a. The gases in an emission nebula do not emit light like a black body. b. We see reflection nebulae by reflected light, not emitted light. c. The dust grains in reflection nebulae scatter longer wavelengths (redder) of visible light
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Chapter 9 (The Formation & Structure of Stars) Quiz...

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