Question 1

The inverse of the value of H0 is a:

Accepted Answer

A)  time 
B)  mass 
C)  density 
D)  size 
E)  luminosity 
A)  time 
B)  mass 
C)  density 
D)  size 
E)  luminosity

Question 2

What does the value of RU, the scale factor of the universe, tell us?

Accepted Answer

The scale factor tel

Question 3

The cosmic microwave background radiation was emitted when the universe had a size about 1/1000 of today's value. What was the temperature of the microwave background radiation when it was emitted?

Accepted Answer

A)  30 K 
B)  300 K 
C)  3000 K 
D)  30,000 K 
E)  300,000 K 
A)  30 K 
B)  300 K 
C)  3000 K 
D)  30,000 K 
E)  300,000 K

Question 4

The value of the scale factor RU depends inversely on the value of redshift z.

Accepted Answer

A) True 
 B)False

Question 5

If there were more baryons in the universe immediately after the Big Bang, then the abundance of __________ in stars and galaxies would be higher.

Accepted Answer

A)  hydrogen 
B)  carbon 
C)  uranium 
D)  helium 
E)  oxygen 
A)  hydrogen 
B)  carbon 
C)  uranium 
D)  helium 
E)  oxygen

Question 6

If you found a galaxy with an H$\alpha$ emission line that had a wavelength of 756.3 nm, what would be the galaxy's distance if the Hubble constant is 70 km/s/Mpc? Note that the rest wavelength of the H$\alpha$ emission line is 656.3 nm.

Accepted Answer

A)  650 Mpc 
B)  760 Mpc 
C)  3,200 Mpc 
D)  6,400 Mpc 
E)  7,600 Mpc 
A)  650 Mpc 
B)  760 Mpc 
C)  3,200 Mpc 
D)  6,400 Mpc 
E)  7,600 Mpc

Question 7

In an imaginary universe, astronomers find that there are thousands of galaxies within a few million light years, but beyond those galaxies there is nothing but empty space. Such a universe would be:

Accepted Answer

A)  isotropic and homogeneous 
B)  isotropic but not homogenous 
C)  homogeneous but not isotropic 
D)  neither homogeneous nor isotropic 
E)  lacking any evidence for the Big Bang 
A)  isotropic and homogeneous 
B)  isotropic but not homogenous 
C)  homogeneous but not isotropic 
D)  neither homogeneous nor isotropic 
E)  lacking any evidence for the Big Bang

Question 8

We see the universe around us expanding, which gives distant galaxies an apparent velocity of 70 km/s/Mpc. If you were an astronomer living today in a galaxy that was located 1 billion light years away from us, at what rate would you see the galaxies moving away from you?

Accepted Answer

Because the universe appears to be homog

Question 9

The COBE and WMAP satellites detected fluctuations in the CMB. On average, how big were these fluctuations, and what does that tell us about the universe at a redshift of z = 1,000?

Accepted Answer

After correcting for the dipole on the s

Question 10

There is no special center to the expansion of the universe.

Accepted Answer

A) True 
 B)False

The inverse of the value of H₀ is a:

What does the value of R_U, the scale factor of the universe, tell us?

The cosmic microwave background radiation was emitted when the universe had a size about 1/1000 of today's value. What was the temperature of the microwave background radiation when it was emitted?

The value of the scale factor R_U depends inversely on the value of redshift z.

If there were more baryons in the universe immediately after the Big Bang, then the abundance of __________ in stars and galaxies would be higher.

If you found a galaxy with an H $\alpha$ emission line that had a wavelength of 756.3 nm, what would be the galaxy's distance if the Hubble constant is 70 km/s/Mpc? Note that the rest wavelength of the H $\alpha$ emission line is 656.3 nm.

In an imaginary universe, astronomers find that there are thousands of galaxies within a few million light years, but beyond those galaxies there is nothing but empty space. Such a universe would be:

We see the universe around us expanding, which gives distant galaxies an apparent velocity of 70 km/s/Mpc. If you were an astronomer living today in a galaxy that was located 1 billion light years away from us, at what rate would you see the galaxies moving away from you?

The COBE and WMAP satellites detected fluctuations in the CMB. On average, how big were these fluctuations, and what does that tell us about the universe at a redshift of z = 1,000?

There is no special center to the expansion of the universe.

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

Exam 19: The Expanding Universe

The inverse of the value of H0 is a:

What does the value of RU, the scale factor of the universe, tell us?

The cosmic microwave background radiation was emitted when the universe had a size about 1/1000 of today's value. What was the temperature of the microwave background radiation when it was emitted?

The value of the scale factor RU depends inversely on the value of redshift z.

If there were more baryons in the universe immediately after the Big Bang, then the abundance of __________ in stars and galaxies would be higher.

If you found a galaxy with an H α\alphaα emission line that had a wavelength of 756.3 nm, what would be the galaxy's distance if the Hubble constant is 70 km/s/Mpc? Note that the rest wavelength of the H α\alphaα emission line is 656.3 nm.

In an imaginary universe, astronomers find that there are thousands of galaxies within a few million light years, but beyond those galaxies there is nothing but empty space. Such a universe would be:

We see the universe around us expanding, which gives distant galaxies an apparent velocity of 70 km/s/Mpc. If you were an astronomer living today in a galaxy that was located 1 billion light years away from us, at what rate would you see the galaxies moving away from you?

The COBE and WMAP satellites detected fluctuations in the CMB. On average, how big were these fluctuations, and what does that tell us about the universe at a redshift of z = 1,000?

There is no special center to the expansion of the universe.

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

The inverse of the value of H₀ is a:

What does the value of R_U, the scale factor of the universe, tell us?

The value of the scale factor R_U depends inversely on the value of redshift z.

If you found a galaxy with an H $\alpha$ emission line that had a wavelength of 756.3 nm, what would be the galaxy's distance if the Hubble constant is 70 km/s/Mpc? Note that the rest wavelength of the H $\alpha$ emission line is 656.3 nm.