Reference no: EM133352743

1. Quasars are most common with redshifts

less than 0.5
of about 2
greater than 6
less than 0.1

2. The energy from an AGN is produced by

the collision of two spiral galaxies
matter flowing into a supermassive black hole
the collision of two radio jets
the collision of two elliptical galaxies

3. When discovered in the 1960's, a(n) _______ was found to emit large amounts of energy, but through visual and radio telescopes appeared to be a single point of light much like a star.

spiral galaxy
quasar
planet like Venus
E galaxy

4. Soon after discovery, it was observed that quasars had a star-like appearance which was blurred by Earth's atmospheric "seeing". Despite the blurring, it was determined that the intense energy-emitting regions of quasars must be small because they

fluctuate rapidly on time scales as short as a few hours
are very luminous
have high radial velocities
are surrounded by quasar fuzz

5. The proper interpretation of a what a galaxy's redshift measures is

its motion in space away from the big bang
the stretching of space between the galaxy and the observer
the contraction of space between the galaxy and the observer
its motion in space toward the observer

6. The microwave emission detected by Arno Penzias and Robert Wilson fits a blackbody spectrum with a temperature of about

0 K
2.7 K
27 K
7.2 K

7. Arno Penzias and Robert Wilson are famous for

creating the first microwave telescope
detecting the large redshift background radiation from the big bang
finding the direction of the center of the Universe
detecting energy released in the splitting of the electroweak force

8. What was the approximate temperature of the Universe when the recombination took place that produced the cosmic background radiation we observe today?

3 million K
2.7 K
300 K
3000 K

9. The main criterion for deciding between Universe geometries is

age
density
mass
temperature

10. If the dark energy is described by the cosmological constant, then the _______ Universe is _______.?

open; decelerating and will expand forever
open; accelerating and will not expand forever
flat; accelerating and will expand forever
closed; accelerating and will expand forever

11. One explanation of the dark sky Olbers's Paradox is that light can reach us only from objects in space out to a distance in light years _______ the age of the universe in years.

less than
equal to
less than or equal to
greater than

12. Ordinary matter makes up approximately _______ percent of the critical density of the Universe.

4.5
10
0.1
1

13. The flatness problem states that the

Universe is one-dimensional
density of the Universe is much larger than the critical density
density of the Universe is very close to the critical density
density of the Universe is much less than the critical density

14. In the late 1990's, it was discovered from distances of _______ in distant galaxies that the expansion of the Universe is _______.

supernovae; decelerating
Cepheid variables; accelerating
supernovae; accelerating
Cepheid variables; decelerating

15. The acceleration of the Universe depends on the effect of

baryonic matter being greater than the effects of dark matter and dark energy
dark matter and dark energy being greater than the effect of baryonic matter
baryonic matter and dark matter being greater than the effect of dark energy
baryonic matter and dark energy being greater than the effect of dark matter