C we see stars orbiting a dark object and infer its

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Unformatted text preview: rbiting a dark object and infer its mass from Kepler's laws. D. We see the accretion disk around the black hole. ____ 9. The A. B. C. D. luminosity of the most luminous QSOs is equal to: 1000 spiral galaxies. 10 spiral galaxies. the most luminous of the giant elliptical galaxies. a typical spiral galaxy. spectrum of a QSO: is similar to the spectrum of a hot, luminous star. has strong, broad emission lines of H, He, and other elements. has extremely broad absorption lines of H, He, and other elements. is generally featureless but may have some weak absorption lines. ____ 10. Two Cepheid variable stars have periods of 10 days and 50 days. The Cepheid variable with the 50-days period is: A. more distant. B. smaller. C. hotter. D. more luminous. 2 ID: B Week 13 Answer Section MULTIPLE CHOICE 1. 2. 3. 4. 5. 6. 7. 8. 9. 1 0. B D D D C A C C B D 1...
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