Question 1

The spectra of most galaxies tell us that:

Accepted Answer

A)  most galaxies appear to be moving away from us 
B)  their light comes predominantly from objects other than stars 
C)  most galaxies contain clouds of gas that are absorbing their favorite wavelengths 
D)  galaxies in the past rotated at a faster rate than they do today 
A)  most galaxies appear to be moving away from us 
B)  their light comes predominantly from objects other than stars 
C)  most galaxies contain clouds of gas that are absorbing their favorite wavelengths 
D)  galaxies in the past rotated at a faster rate than they do today

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

If you measured the distances and recessional velocities for a sample of galaxies and plotted the data to get the figure below,what value would you derive for the Hubble constant?

Accepted Answer

A)  10 km/s/Mly 
B)  22 km/s/Mly 
C)  45 km/s/Mly 
D)  100 km/s/Mly 
A)  10 km/s/Mly 
B)  22 km/s/Mly 
C)  45 km/s/Mly 
D)  100 km/s/Mly

Question 4

The current temperature of the cosmic background radiation of 2.73 K means that the peak of its spectrum occurs at a wavelength of:

Accepted Answer

A)  1$\mu$m 
B)  10 $\mu$m 
C)  100 $\mu$m 
D)  1,000 $\mu$m 
A)  1$\mu$m 
B)  10 $\mu$m 
C)  100 $\mu$m 
D)  1,000 $\mu$m

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)  deuterium 
D)  helium 
A)  hydrogen 
B)  carbon 
C)  deuterium 
D)  helium

Question 6

If you found a galaxy with a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 756.3 nm,what would be the galaxy's redshift?

Accepted Answer

A)  0.01 
B)  0.05 
C)  0.10 
D)  0.15 
A)  0.01 
B)  0.05 
C)  0.10 
D)  0.15

Question 7

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

Accepted Answer

A)  This universe is homogeneous but not isotropic. 
B)  This universe is isotropic but not homogeneous. 
C)  This universe is both homogeneous and isotropic. 
D)  This universe is neither homogeneous nor isotropic. 
A)  This universe is homogeneous but not isotropic. 
B)  This universe is isotropic but not homogeneous. 
C)  This universe is both homogeneous and isotropic. 
D)  This universe is neither homogeneous nor isotropic.

Question 8

Name two predictions of the standard Big Bang theory that have been verified by observations.

Accepted Answer

The cosmic background radiatio

Question 9

The cosmic background radiation (CBR)has a temperature of approximately 2.7 K and a Planck blackbody spectrum.Calculate the wavelength where the CBR spectrum peaks.

Accepted Answer

@#LAT-DLM&_peak = 2,900 @#LAT-DLM&m

Question 10

The Sun is 27 percent helium by mass.Where was the majority of this helium manufactured?

Accepted Answer

A)  In Type II supernovae that happened before the Sun formed 
B)  In low-mass stars that lived and died before the Sun formed 
C)  In nuclear burning that happened in the Sun's core 
D)  In the Big Bang 
A)  In Type II supernovae that happened before the Sun formed 
B)  In low-mass stars that lived and died before the Sun formed 
C)  In nuclear burning that happened in the Sun's core 
D)  In the Big Bang

Question 11

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

Accepted Answer

A)  This universe is homogeneous but not isotropic. 
B)  This universe is isotropic but not homogeneous. 
C)  This universe is both homogeneous and isotropic. 
D)  This universe is neither homogeneous nor isotropic. 
A)  This universe is homogeneous but not isotropic. 
B)  This universe is isotropic but not homogeneous. 
C)  This universe is both homogeneous and isotropic. 
D)  This universe is neither homogeneous nor isotropic.

The spectra of most galaxies tell us that:

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

If you measured the distances and recessional velocities for a sample of galaxies and plotted the data to get the figure below,what value would you derive for the Hubble constant?

The current temperature of the cosmic background radiation of 2.73 K means that the peak of its spectrum occurs at a wavelength of:

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 a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 756.3 nm,what would be the galaxy's redshift?

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

Name two predictions of the standard Big Bang theory that have been verified by observations.

The cosmic background radiation (CBR)has a temperature of approximately 2.7 K and a Planck blackbody spectrum.Calculate the wavelength where the CBR spectrum peaks.

The Sun is 27 percent helium by mass.Where was the majority of this helium manufactured?

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

Our Place in the Universe

Patterns in the Skymotions of Earth

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Realm of the Galaxies

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

Exam 14: The Expansion of Space

The spectra of most galaxies tell us that:

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

If you measured the distances and recessional velocities for a sample of galaxies and plotted the data to get the figure below,what value would you derive for the Hubble constant?

The current temperature of the cosmic background radiation of 2.73 K means that the peak of its spectrum occurs at a wavelength of:

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 a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 756.3 nm,what would be the galaxy's redshift?

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

Name two predictions of the standard Big Bang theory that have been verified by observations.

The cosmic background radiation (CBR)has a temperature of approximately 2.7 K and a Planck blackbody spectrum.Calculate the wavelength where the CBR spectrum peaks.

The Sun is 27 percent helium by mass.Where was the majority of this helium manufactured?

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

Our Place in the Universe

Patterns in the Skymotions of Earth

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Realm of the Galaxies

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

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