Chapter 15 Test

© 2007 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students except by instructors using the accompanying text in their classes. All recipients of this work are expected to abide by these restrictions and to honor the intended pedagogical purposes and the needs of other instructors who rely on these materials. Conceptual Test PRS-Enabled Chapter 15 ASTRONOMY, A Beginner’s Guide to the Universe 5 th edition Chaisson McMillan

1) disk and spiral arms. 2) halo. 3) central bulge. 4) open clusters. 5) companion galaxies, the Magellanic Clouds. Question 1 Based on their shapes and stars, elliptical galaxies are most like the Milky Way’s

1) disk and spiral arms. 2) halo. 3) central bulge. 4) open clusters. 5) companion galaxies, the Magellanic Clouds. Question 1 Based on their shapes and stars, elliptical galaxies are most like the Milky Way’s Like the stars and globular clusters in our Halo, elliptical galaxies contain little or no gas and dust to make new stars.

1) ongoing star formation 2) a disk, bulge, and halo 3) globular clusters in the halo 4) open clusters in the disk 5) all of the above Question 2 What property is shared by spiral galaxies?

1) ongoing star formation 2) a disk, bulge, and halo 3) globular clusters in the halo 4) open clusters in the disk 5) all of the above Question 2 What property is shared by spiral galaxies? M-51, a Type Sb Spiral

1) giant globular clusters in the halo. 2) small irregular galaxies that orbit the Milky Way. 3) large molecular clouds in the disk of the Galaxy. 4) the brightest ionized Hydrogen regions in our galaxy. 5) spiral nebulae originally discovered by Herschel. Question 3 The Magellanic Clouds are

1) Most galaxies showed redshifts. 2) All galaxies showed blueshifts. 3) Galaxies showed about half redshifts and half blueshifts. 4) Galaxies showed no line shifts at all. 5) Some galaxies showed a redshift that changed into a blueshift at other times. Question 4 Hubble took spectra of galaxies in the 1930s. What did he find?

1) Most galaxies showed redshifts. 2) All galaxies showed blueshifts. 3) Galaxies showed about half redshifts and half blueshifts. 4) Galaxies showed no line shifts at all. 5) Some galaxies showed a redshift that changed into a blueshift at other times. Question 4 Hubble took spectra of galaxies in the 1930s. What did he find? Redshifts of galaxies indicate they are moving away from us.

1) more distant galaxies showing greater blue shifts. 2) distant quasars appearing proportionally dimmer. 3) more distant galaxies showing greater red shifts. 4) slowly varying Cepheid variables appearing brighter. 5) more distant galaxies appearing younger. Question 5 Hubble’s law is based upon

1) more distant galaxies showing greater blue shifts. 2) distant quasars appearing proportionally dimmer. 3) more distant galaxies showing greater red shifts. 4) slowly varying Cepheid variables appearing brighter. 5) more distant galaxies appearing younger. Question 5 Hubble’s law is based upon v

1) the density of galaxies in the universe. 2) the luminosity of distant galaxies. 3) the reddening of light from dust clouds. 4) the speed of a galaxy. 5) the rate of expansion of the universe. Question 6 Hubble’s constant measures

Question 6 Hubble’s constant measures Hubble’s law relates how fast galaxies are moving away from us at different distances. A larger value for H 0 implies a faster expansion rate. Velocity = H o x Distance 1) the density of galaxies in the universe. 2) the luminosity of distant galaxies. 3) the reddening of light from dust clouds. 4) the speed of a galaxy. 5) the rate of expansion of the universe.

1) the size of the universe. 2) distances to galaxies. 3) the speed of recession of galaxies. 4) the density of matter in the universe. 5) the temperature of the Big Bang. Question 7 To calibrate Hubble’s constant, astronomers must determine

1) the size of the universe. 2) distances to galaxies. 3) the speed of recession of galaxies. 4) the density of matter in the universe. 5) the temperature of the Big Bang. Question 7 To calibrate Hubble’s constant, astronomers must determine Distances to galaxies are determined using a variety of “standard candles,” including Cepheid variables, supernova explosions, model galaxies, and model clusters.

1) the universe is static. 2) the universe is collapsing. 3) the universe is expanding. 4) the Milky Way is the center of the universe. 5) There is no accepted interpretation. Question 8 Hubble’s discovery of galaxy redshifts means

1) they generate energy partly through H to He fusion like stars. 2) they show spectra similar to extremely bright O stars. 3) their luminosity varies like eclipsing binary stars. 4) in short photographs, their images appear stellar. 5) they are dense concentrations of millions of stars. Question 9 Quasars are “quasi-stellar” because

1) they generate energy partly through H to He fusion like stars. 2) they show spectra similar to extremely bright O stars. 3) their luminosity varies like eclipsing binary stars. 4) in short photographs, their images appear stellar. 5) they are dense concentrations of millions of stars. Question 9 Quasars are “quasi-stellar” because Although short-exposure images can appear starlike, many quasars show jets or other signs of intense activity. v

1) supermassive black holes at their cores. 2) dark matter. 3) self-sustaining star formation. 4) spiral density waves. 5) hypernova explosions. Question 10 Seyfert and Radio galaxies could be powered by

1) supermassive black holes at their cores. 2) dark matter. 3) self-sustaining star formation. 4) spiral density waves. 5) hypernova explosions. Question 10 Seyfert and Radio galaxies could be powered by The Circinus galaxy, a Seyfert galaxy about 4 Mpc away

1) sudden bursts of star formation. 2) supernova chain reactions in the core. 3) the collapse of the core into a larger black hole. 4) close encounters with a nearby galaxy. 5) dark matter becoming visible and emitting light. Question 11 In active galaxies, the central engine can be “fed” by

1) sudden bursts of star formation. 2) supernova chain reactions in the core. 3) the collapse of the core into a larger black hole. 4) close encounters with a nearby galaxy. 5) dark matter becoming visible and emitting light. Question 11 In active galaxies, the central engine can be “fed” by Collisions or tidal interaction between galaxies can provide new fuel to power the supermassive black hole engines of active galaxies.

Chapter 15 Test

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Chapter 15 Test