Question 1

Star E is the same temperature as star F,but star E is four times as luminous as star F.How do the radii of the stars compare?

Accepted Answer

A)  Star E has twice the radius of star F.
B)  Star E has four times the radius of star F.
C)  Star F has twice the radius of star E.
D)  Star F has four times the radius of star E.
E)  They are the same size.F) None of the above
G) B) and E)

Question 2

Star A is a red star.Star B is a blue star.Which star is hotter?

Accepted Answer

A)  Star A is hotter.
B)  Star B is hotter.
C)  They are the same temperature.
D)  We also need to know the luminosities of the stars to determine their temperatures.
E)  Color is not related to temperature at all.F) C) and E)
G) C) and D)

Question 3

Spectra of the least massive main-sequence stars show the largest amount of absorption from molecules like TiO and CN.

Accepted Answer

A) True 
 B)False

Question 4

Star A and star B both have the same temperature but different sizes and distances.As a result,star A is more luminous than star B,but star B is brighter than star A.Which of these statements about the absolute and apparent magnitudes of the two stars is correct?

Accepted Answer

A)  Star A has a larger apparent magnitude and a larger absolute magnitude.
B)  Star A has a larger apparent magnitude,while star B has a larger absolute magnitude.
C)  Star B has a larger apparent magnitude and a larger absolute magnitude.
D)  Star B has a larger apparent magnitude,while star A has a larger absolute magnitude.
E)  Both stars have the same apparent and absolute magnitudes.F) D) and E)
G) A) and C)

Question 5

If a star's parallax is measured using identical telescopes,one on Earth and the other on Mars,which planet's telescope would measure the biggest parallax? Explain your answer.

Accepted Answer

The telescope on Mars would measure a la...

Question 6

How many arcseconds are there in 1 degree?

Accepted Answer

A)  60
B)  360
C)  3,600
D)  6,000
E)  36,000F) B) and E)
G) All of the above

Question 7

What spectral class is the Sun?

Accepted Answer

A)  A0
B)  B7
C)  F5
D)  M3
E)  G2F) B) and E)
G) A) and B)

Question 8

Stars are made mostly of:

Accepted Answer

A)  helium
B)  oxygen
C)  hydrogen
D)  nitrogen
E)  carbonF) C) and E)
G) A) and B)

Question 9

The star named Capella has an apparent magnitude of 0,while the star named Polaris has an apparent magnitude of 2,which means that Capella is _________ than Polaris.

Accepted Answer

A)  18 times fainter
B)  6 times fainter
C)  2 times fainter
D)  2 times brighter
E)  6 times brighterF) A) and D)
G) B) and C)

Question 10

If we know the temperature and luminosity of a star,we can also calculate its:

Accepted Answer

A)  radius
B)  mass
C)  chemical composition
D)  brightness
E)  all of the aboveF) C) and D)
G) A) and B)

Question 11

Star A is exactly the same color as star B and appears equally bright.Through stellar parallax measurements,we find that star B is twice as far away from us as star A.Determine which star has the largest radius and how much larger it is.

Accepted Answer

For stars of equal brightness,luminosity...

Question 12

Eclipsing binary systems:

Accepted Answer

A)  orbit in the plane of the sky
B)  exhibit large radial velocity shifts
C)  contain equal mass stars
D)  contain stars that pass in front of one another during their orbit
E)  contain stars that can be resolved as two separate starsF) A) and E)
G) A) and B)

Question 13

The Hertzsprung-Russell diagram is a graph of _________ for stars.

Accepted Answer

A)  mass versus brightness
B)  size versus mass
C)  luminosity versus temperature
D)  mass versus spectral type
E)  luminosity versus brightnessF) A) and B)
G) C) and D)

Question 14

A star's mass determines where it lies on the main sequence of an H-R diagram.

Accepted Answer

A) True 
 B)False

Question 15

Astronomers can measure the speed of the stars in a binary system by measuring the _________ of the stars.

Accepted Answer

A)  temperatures
B)  luminosities
C)  distance
D)  colors
E)  spectraF) C) and D)
G) B) and D)

Question 16

The one property of a main-sequence star that determines all its other properties is its:

Accepted Answer

A)  luminosity
B)  mass
C)  temperature
D)  spectral type
E)  brightnessF) A) and E)
G) A) and B)

Question 17

The absolute magnitude of a star is a measure of its luminosity.

Accepted Answer

A) True 
 B)False

Question 18

On a typical H-R diagram,where are the stars with the largest radii located?

Accepted Answer

A)  in the upper left corner
B)  in the upper right corner
C)  in the center
D)  in the lower left corner
E)  in the lower right cornerF) C) and D)
G) A) and B)

Question 19

The stars that have the largest radii are classified as supergiants.

Accepted Answer

A) True 
 B)False

Question 20

Imagine you are observing a nearby star.You know that it is a main-sequence star but don't know anything else about it.If you had access to any telescope equipment you wanted,explain how you would determine this star's temperature,luminosity,distance,and radius.

Accepted Answer

You could measure the temperature either...

Exam 13: Taking the Measure of Stars

The stars that have the largest radii are classified as supergiants.

Correct AnswerverifiedShow Answer

If we know the temperature and luminosity of a star,we can also calculate its:

Correct AnswerverifiedShow Answer

Star A and star B both have the same temperature but different sizes and distances.As a result,star A is more luminous than star B,but star B is brighter than star A.Which of these statements about the absolute and apparent magnitudes of the two stars is correct?

Correct AnswerverifiedShow Answer

Star A is exactly the same color as star B and appears equally bright.Through stellar parallax measurements,we find that star B is twice as far away from us as star A.Determine which star has the largest radius and how much larger it is.

Correct AnswerverifiedFor stars of equal brightness,luminosity...View AnswerShow Answer

The one property of a main-sequence star that determines all its other properties is its:

Correct AnswerverifiedShow Answer

The Hertzsprung-Russell diagram is a graph of _________ for stars.

Correct AnswerverifiedShow Answer

Spectra of the least massive main-sequence stars show the largest amount of absorption from molecules like TiO and CN.

Correct AnswerverifiedShow Answer

Star A is a red star.Star B is a blue star.Which star is hotter?

Correct AnswerverifiedShow Answer

Eclipsing binary systems:

Correct AnswerverifiedShow Answer

Imagine you are observing a nearby star.You know that it is a main-sequence star but don't know anything else about it.If you had access to any telescope equipment you wanted,explain how you would determine this star's temperature,luminosity,distance,and radius.

Correct AnswerverifiedYou could measure the temperature either...View AnswerShow Answer

What spectral class is the Sun?

Correct AnswerverifiedShow Answer

On a typical H-R diagram,where are the stars with the largest radii located?

Correct AnswerverifiedShow Answer

How many arcseconds are there in 1 degree?

Correct AnswerverifiedShow Answer

Stars are made mostly of:

Correct AnswerverifiedShow Answer

Star E is the same temperature as star F,but star E is four times as luminous as star F.How do the radii of the stars compare?

Correct AnswerverifiedShow Answer

The absolute magnitude of a star is a measure of its luminosity.

Correct AnswerverifiedShow Answer

The star named Capella has an apparent magnitude of 0,while the star named Polaris has an apparent magnitude of 2,which means that Capella is _________ than Polaris.

Correct AnswerverifiedShow Answer

If a star's parallax is measured using identical telescopes,one on Earth and the other on Mars,which planet's telescope would measure the biggest parallax? Explain your answer.

Correct AnswerverifiedThe telescope on Mars would measure a la...View AnswerShow Answer

Astronomers can measure the speed of the stars in a binary system by measuring the _________ of the stars.

Correct AnswerverifiedShow Answer

A star's mass determines where it lies on the main sequence of an H-R diagram.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
For stars of equal brightness,luminosity...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
You could measure the temperature either...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The telescope on Mars would measure a la...
View Answer

Correct Answer
verified

Correct Answer
verified