Question 1

Explain why stars displaying spectral lines of molecules must be relatively cool.

Accepted Answer

Molecules would brea...

Question 2

A star with an apparent magnitude of 10 appears fainter than a star with an apparent magnitude of 9.

Accepted Answer

A) True 
 B)False

Question 3

Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7?

Accepted Answer

A star with apparent magnitude...

Question 4

You observe a star and you want to plot it on an H-R diagram. You will need to measure all of the following, except the star's ________.

Accepted Answer

A)   mass
B)   distance
C)   apparent brightness
D)   spectral typeE) A) and B)
F) A) and C)

Question 5

To calculate the masses of stars in a binary system, we must measure their ________.

Accepted Answer

A)   orbital period and average orbital distance
B)   spectral types and distance from Earth
C)   absolute magnitudes and luminosities
D)   luminosities and distance from EarthE) A) and B)
F) A) and C)

Question 6

Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?

Accepted Answer

A)   The star is a member of a binary star system.
B)   The star is of spectral type G.
C)   The star is of spectral type A.
D)   We know the star's luminosity and distance.E) B) and C)
F) A) and C)

Question 7

Which o the following stars are brightest at ultraviolet wavelengths?

Accepted Answer

A)   O and B stars
B)   A and F stars
C)   G and K stars
D)   M stars
E)   none, all stars are brightest at optical wavelengthsF) B) and C)
G) A) and C)

Question 8

The most distant stars we can measure stellar parallax for are approximately

Accepted Answer

A)   5 parsecs away.
B)   100 parsecs away.
C)   10,000 parsecs away.
D)   halfway across the Milky Way Galaxy.
E)   in the Andromeda Galaxy.F) A) and E)
G) A) and B)

Question 9

The faintest star visible to the naked eye has an apparent magnitude of about

Accepted Answer

A)   10.
B)   6.
C)   1.
D)   0.
E)   6.0F) C) and D)
G) A) and E)

Exam 11: Surveying the Stars

Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?

Correct Answer
verified

Explain why stars displaying spectral lines of molecules must be relatively cool.

Correct Answer
verified
Molecules would brea...
View Answer

A star with an apparent magnitude of 10 appears fainter than a star with an apparent magnitude of 9.

Correct Answer
verified

The most distant stars we can measure stellar parallax for are approximately

Correct Answer
verified

You observe a star and you want to plot it on an H-R diagram. You will need to measure all of the following, except the star's ________.

Correct Answer
verified

Which o the following stars are brightest at ultraviolet wavelengths?

Correct Answer
verified

The faintest star visible to the naked eye has an apparent magnitude of about

Correct Answer
verified

To calculate the masses of stars in a binary system, we must measure their ________.

Correct Answer
verified

Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7?

Correct Answer
verified
A star with apparent magnitude...
View Answer

Exam 11: Surveying the Stars

Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?

Correct AnswerverifiedShow Answer

Explain why stars displaying spectral lines of molecules must be relatively cool.

Correct AnswerverifiedMolecules would brea...View AnswerShow Answer

A star with an apparent magnitude of 10 appears fainter than a star with an apparent magnitude of 9.

Correct AnswerverifiedShow Answer

The most distant stars we can measure stellar parallax for are approximately

Correct AnswerverifiedShow Answer

You observe a star and you want to plot it on an H-R diagram. You will need to measure all of the following, except the star's ________.

Correct AnswerverifiedShow Answer

Which o the following stars are brightest at ultraviolet wavelengths?

Correct AnswerverifiedShow Answer

The faintest star visible to the naked eye has an apparent magnitude of about

Correct AnswerverifiedShow Answer

To calculate the masses of stars in a binary system, we must measure their ________.

Correct AnswerverifiedShow Answer

Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7?

Correct AnswerverifiedA star with apparent magnitude...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified
Molecules would brea...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A star with apparent magnitude...
View Answer