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Unformatted text preview: eft behind when the QSO formed.
D. Clouds of hot gas fed by jets of gas from the QSO. 1 Test Form: B
____ 5. To account for all the QSOs seen in the distant universe, how many nearby galaxies must once have
harbored a QSO?
A. Only the giant elliptical galaxies.
B. About 1% of all spiral and elliptical galaxies.
C. Nearly all the spiral and elliptical galaxies.
D. Nearly all galaxies, including the many dwarf irregular galaxies. ____ 6. The
D. ____ 7. Hubble's law says:
A. elliptical galaxies evolve into spiral or barred spiral galaxies.
B. the luminosity of a galaxy is inversely proportional to its distance.
C. the distance to a galaxy is proportional to its radial velocity.
D. there is a relation between the pulsation period and luminosity of Cepheid variable
stars. ____ 8. How do we know that there is a supermassive black hole at the center of our galaxy?
A. It has a high luminosity, about 1% of the luminosity of a QSO.
B. It is ejecting two jets at nearly the speed of light and the jets are emitting
C. We see stars o...
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This document was uploaded on 02/10/2014.
- Fall '14