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B. large spiralAnswersThe answers are:1. Most emission from the Milky Way's nucleus and activegalaxies comes from:C. high-speed electrons in magnetic fields.2. In comparing the Milky Way with active galaxies ingeneral, which of the following is a characteristic both havein common?A. At least part of the nuclear emission is nonthermal.3. Radio observations with the VLA of Centaurus A, thenearest active galaxy, show all of the following EXCEPTthat the:C. visible galaxy is a normal, dust-free elliptical.4. Compared with the Milky Way Galaxy, a typical activegalaxy:A. produces more energy, chiefly nonthermal, each second thandoes our galaxy.5. The most remarkable observed feature of quasars is theirlarge:
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B. red shifts in emission lines.6. What causes the spectra of most quasars contain narrowdark lines?B. The light must pass through a cool, transparent clouds of gas.7. The broad emission lines in quasar spectra imply thattheir central regions contain:C. hot, fast-moving transparent gas.8. The most widely-accepted explanation for the large redshifts of quasars is that:A. they obey Hubble's law.9. If a quasar is the hyperactive nucleus of a distant, younggalaxy, then which of these is NOT true?D. Quasars should be larger than older galaxies which havealready condensed.10. Which of the following is NOT typical of at least someactive galaxies and quasars?D. Most visible light comes from blue stars in spiral arms.11. How do astronomers find the distances to quasars?B. By applying Hubble's law to their red shifts.12. If a supermassive black hole drives the nuclear activityof active galaxies, then:A. infalling matter forms an accretion disk around it, with bi-polar jets arising.13. What observed feature of double-lobed radio galaxiesindicates that the nucleus is the source of the particles thatpower the radio emission from the lobes?A. Thin jets connecting the nucleus to the lobes.14. In general, the radio jets seen extending from the nucleiof active galaxies have:C. a nonthermal (synchrotron) spectrum.15. The lighthouse model for the emission of radiation bypulsars is most noted for:B. directing the radiation into beams like a flashlight.16. Astrophysicists are most certain that a black hole is:C. the remains of stardeath with infinite density.17. The Generic Model for AGN would not be useful inunderstanding:
C. pulsars.18. What is NOT true of Active Galaxies?A. They are all ellipticals.19. What is not true of Quasars?B. They have very narrow spectral line emission.20. Galactic jets are observed to emit synchrotron radiationthat is polarized. This is evidence that the jets are:D. streams of relativistic electrons.21. In order to produce synchrotron emission, you need:A. a source of high-speed electrons with fairly strong magneticfields.

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Term
Three
Professor
Bailey
Tags
Solar System, The Land, Planet, d, Extrasolar planet
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
College Algebra
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Chapter 2 / Exercise 48
College Algebra
Gustafson/Hughes
Expert Verified

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