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Chapter 13 & 14

True/False
Indicate whether the statement is true or false. (1-Point Each)
 

 1. 

Quasar red shifts are usually larger than the red shifts of the visible galaxies.
 

 2. 

Some quasars have fuzz around them that produces spectra similar to normal galaxies.
 

 3. 

Some large clusters of galaxies do not appear to contain enough mass to hold themselves together.
 

 4. 

The rotation curve method can be applied only to pairs of galaxies orbiting each other.
 

 5. 

The Milky Way galaxy is not a radio galaxy, it emits no radio radiation.
 

 6. 

Cepheid variable stars are more luminous than the sun.
 

 7. 

When two galaxies collide, they pass through each other and their stars almost never collide.
 

 8. 

When a large galaxy collides with a small galaxy, the smaller galaxy may be pulled apart by tidal forces.
 

 9. 

Until recently, most astronomers thought elliptical galaxies were shaped like oblate spheroids.
 

 10. 

Elliptical galaxies contain more gas, dust and young stars than do Sa galaxies.
 

 11. 

The rapid fluctuations of quasars show that the objects must be very small.
 

 12. 

The look-back time is numerically equal to the distance to a galaxy in light-years.
 

 13. 

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question. (3-Points Each)
 

 14. 

The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that
a.
they are formed by material falling into the galaxy.
b.
they are powered by magnetic fields.
c.
they are excited by radiation from nearby galaxies.
d.
they are powered by the rapid rotation of the galaxy.
e.
they are created by jets from the galaxy.
 

 15. 

What was the first evidence that quasars were different from any objects observed before they were discovered?
a.
The first quasars were seen to have fuzz.
b.
Quasars emitted radio energy like active galaxies, but appeared to be point sources at visible light.
c.
Quasars showed significant gravitational lens effects.
d.
The spectra of quasars looked like that of an M dwarf.
e.
The large red shifts originally indicated that they were orbiting the center of the Milky Way.
 

 16. 

A megaparsec is equivalent to
a.
3.26 light-years.
b.
206,265 light years.
c.
206,265 AU.
d.
3,260,000 light-years.
e.
the diameter of the Milky Way galaxy.
 

 17. 

That the radio lobes radiate synchrotron radiation indicates that
a.
high speed electrons are spiraling through a magnetic field.
b.
the source of the radio jets must be a black hole.
c.
the source of the radio energy is rotating rapidly.
d.
the central galaxy must be a giant elliptical galaxy.
e.
the central galaxy must rotate about two nearly perpendicular axes.
 

 18. 

Quasars must be small because they
a.
have high radial velocities.
b.
are very luminous.
c.
are surrounded by quasar fuzz.
d.
radiate huge amounts of energy.
e.
fluctuate rapidly.
 

 19. 

Galactic cannibalism refers to
a.
binary galaxies.
b.
the merging of galaxies.
c.
galaxies drawing in gas from the intergalactic medium.
d.
the destruction of a galaxies globular clusters by the galaxies nucleus.
e.
none of these
 

 20. 

Observations of galaxies and clusters of galaxies indicate that about _________ per cent of the universe is dark matter.
a.
5
b.
25
c.
50
d.
75
e.
95
 

 21. 

The look-back time is
a.
how long the light from an object takes to reach Earth.
b.
numerically equal to the distance in light-years.
c.
smaller for more distant objects.
d.
all of the above
e.
a and b above
 

 22. 

The rotation curve of a galaxy can be used to determine
a.
the relative number of hot young stars in the galaxy.
b.
the relative amount of gas and dust in the galaxy.
c.
the radius of the galaxy.
d.
the luminosity of the galaxy.
e.
the mass of the galaxy.
 



 
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