Question 1

If the inflation theory is correct, the geometry of the universe is flat and Euclidean.

Accepted Answer

A) True 
 B)False

Question 2

Before the decoupling,

Accepted Answer

A)   deuterium produced electrons and positrons.
B)   protons and electrons combined to form atoms.
C)   the universe was opaque to radiation.
D)   there was more helium than hydrogen.
E)   the universe was transparent to radiation.F) C) and D)
G) B) and C)

Question 3

How would the geometry of a universe with ▲o greater than 1 differ from one with ▲o less than 1?

Accepted Answer

If ▲o is greater than 1, the g...

Question 4

In 1992, COBE observations revealed

Accepted Answer

A)   the dark matter in the universe is normal (baryonic) , so the universe is closed.
B)   there are small ripples in the microwave background, the seeds of galaxies.
C)   the existence of dark energy.
D)   the microwave background radiation is not isotropic, but centered on Virgo.
E)   that the universe had less than the critical density, so was open.F) B) and D)
G) D) and E)

Question 5

Discuss the value of Ho if the universe were closed and starting to collapse.

Accepted Answer

In the contractive p...

Question 6

Cosmic inflation continues today in the cosmological redshifts and dark energy.

Accepted Answer

A) True 
 B)False

Question 7

The critical number for the rate of universal expansion and age of the Big Bang is .

Accepted Answer

The answer of The critical number for the rate of...

Question 8

The primordial nucleosynthesis was sped up by the abundance of in the universe once the temperature dropped below a billion K.

Accepted Answer

A)   deuterium
B)   tritium
C)   hydrogen
D)   helium
E)   helium- 3F) All of the above
G) A) and D)

Question 9

The 3 K background radiation represents

Accepted Answer

A)   the formation of the first galaxies.
B)   formation of the first quasar.
C)   the outer edge of the universe.
D)   the time of decoupling.
E)   the Big Bang itself.F) D) and E)
G) A) and B)

Question 10

The Big Bang has time in primordial nucleosynthesis to make only H and He in abundance.

Accepted Answer

A) True 
 B)False

Question 11

Since the finding of dark energy, almost all data supports a(n) _ universe.

Accepted Answer

open or cr...

Question 12

The universe is dominated by dark .

Accepted Answer

The answer of The universe is dominated by dark ....

Question 13

In the Big Bang model, two possible fates exist: expansion forever, or cosmic collapse.

Accepted Answer

A) True 
 B)False

Question 14

There is a superforce that separates into the electromagnetic, weak, and strong nuclear forces below a critical temperature.

Accepted Answer

A) True 
 B)False

Question 15

Why were Type I supernovae so critical in discovering dark energy?

Accepted Answer

These brilliant explosions are consisten...

Question 16

Helium production ceased when the universe was about minutes old, and did not resume until the first generation of stars formed.

Accepted Answer

The answer of Helium production ceased when the universe was...

Question 17

Perhaps as much as 95% of the matter in superclusters is dark matter.

Accepted Answer

A) True 
 B)False

Question 18

What temperature has the Big Bang cooled to by now?

Accepted Answer

A)   5,800 K
B)   just over 2.7 K
C)   about 3,000 K
D)   1.4 K
E)   about 300 KF) A) and B)
G) B) and C)

Question 19

Primordial nucleosynthesis implies the Big Bang makes all elements up to iron.

Accepted Answer

A) True 
 B)False

Question 20

How does the energy of the cosmic microwave background compare to the energy radiated by all the stars and galaxies that ever existed?

Accepted Answer

A)   73% cosmic background, 27% starlight
B)   They are very close to being equal.
C)   about ten times more from the Big Bang than from stars and galaxies
D)   The starlight now dominates the background, as your eyes show clearly.
E)   We have no way of comparing matter and energy this way.F) B) and E)
G) B) and D)

Exam 18: Cosmology: the Big Bang and the Fate of the Universe

How does the energy of the cosmic microwave background compare to the energy radiated by all the stars and galaxies that ever existed?

Correct AnswerverifiedShow Answer

Helium production ceased when the universe was about minutes old, and did not resume until the first generation of stars formed.

Correct AnswerverifiedShow Answer

Before the decoupling,

Correct AnswerverifiedShow Answer

In the Big Bang model, two possible fates exist: expansion forever, or cosmic collapse.

Correct AnswerverifiedShow Answer

The universe is dominated by dark .

Correct AnswerverifiedShow Answer

There is a superforce that separates into the electromagnetic, weak, and strong nuclear forces below a critical temperature.

Correct AnswerverifiedShow Answer

The 3 K background radiation represents

Correct AnswerverifiedShow Answer

The critical number for the rate of universal expansion and age of the Big Bang is .

Correct AnswerverifiedShow Answer

The primordial nucleosynthesis was sped up by the abundance of in the universe once the temperature dropped below a billion K.

Correct AnswerverifiedShow Answer

Since the finding of dark energy, almost all data supports a(n) _ universe.

Correct Answerverifiedopen or cr...View AnswerShow Answer

If the inflation theory is correct, the geometry of the universe is flat and Euclidean.

Correct AnswerverifiedShow Answer

What temperature has the Big Bang cooled to by now?

Correct AnswerverifiedShow Answer

Cosmic inflation continues today in the cosmological redshifts and dark energy.

Correct AnswerverifiedShow Answer

Perhaps as much as 95% of the matter in superclusters is dark matter.

Correct AnswerverifiedShow Answer

In 1992, COBE observations revealed

Correct AnswerverifiedShow Answer

How would the geometry of a universe with ▲o greater than 1 differ from one with ▲o less than 1?

Correct AnswerverifiedIf ▲o is greater than 1, the g...View AnswerShow Answer

Primordial nucleosynthesis implies the Big Bang makes all elements up to iron.

Correct AnswerverifiedShow Answer

Why were Type I supernovae so critical in discovering dark energy?

Correct AnswerverifiedThese brilliant explosions are consisten...View AnswerShow Answer

The Big Bang has time in primordial nucleosynthesis to make only H and He in abundance.

Correct AnswerverifiedShow Answer

Discuss the value of Ho if the universe were closed and starting to collapse.

Correct AnswerverifiedIn the contractive p...View AnswerShow Answer

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open or cr...
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If ▲o is greater than 1, the g...
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These brilliant explosions are consisten...
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In the contractive p...
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