Question 1

Stars A and B appear equally bright,but star A is twice as far away from us as star B.Which of the following is true?

Accepted Answer

A)  Star A is twice as luminous as star B. 
B)  Star A is four times as luminous as star B. 
C)  Star B is twice as luminous as star A. 
D)  Star B is four times as luminous as star B. 
A)  Star A is twice as luminous as star B. 
B)  Star A is four times as luminous as star B. 
C)  Star B is twice as luminous as star A. 
D)  Star B is four times as luminous as star B. B

Question 2

All of the following are useful in determining the masses of stars in a binary system EXCEPT:

Accepted Answer

A)  the period of the orbits of the two stars. 
B)  the average separation between the two stars. 
C)  the luminosities of the two stars. 
D)  the velocities of the two stars. 
A)  the period of the orbits of the two stars. 
B)  the average separation between the two stars. 
C)  the luminosities of the two stars. 
D)  the velocities of the two stars. C

Question 3

Describe the luminosity classes found on the H-R diagram below.

Accepted Answer

The luminosity classes on the H-R diagram include supergiants,bright giants,giants,and subgiants (I,II,III,IV),the main-sequence (V)stars,and the white dwarfs (WD).

Question 4

If given the image alone in the figure below,what further information might be required to determine that the stars are a visual binary system?

Accepted Answer

To determine that the stars ar

Question 5

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. 
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.

Question 6

What spectral class is the Sun?

Accepted Answer

A)  A0 
B)  G2 
C)  F5 
D)  M3 
A)  A0 
B)  G2 
C)  F5 
D)  M3

Question 7

How is the distance to a star related to its parallax?

Accepted Answer

A)  Distance is directly proportional to parallax. 
B)  Distance is inversely proportional to parallax. 
C)  Distance is directly proportional to parallax squared. 
D)  Distance is inversely proportional to parallax squared. 
A)  Distance is directly proportional to parallax. 
B)  Distance is inversely proportional to parallax. 
C)  Distance is directly proportional to parallax squared. 
D)  Distance is inversely proportional to parallax squared.

Question 8

In what ways are energy states of an atom like books occupying shelves in a bookcase?

Accepted Answer

Electrons can only occupy cert

Question 9

Stars of similar temperatures but different sizes will have:

Accepted Answer

A)  similar luminosities but different masses. 
B)  similar masses but different distances. 
C)  different spectral types but similar luminosities. 
D)  similar spectral types but different luminosities. 
A)  similar luminosities but different masses. 
B)  similar masses but different distances. 
C)  different spectral types but similar luminosities. 
D)  similar spectral types but different luminosities.

Question 10

What is the difference between brightness and luminosity?

Accepted Answer

A)  These are different names for the same property. 
B)  Luminosity is how bright the star appears to us; brightness is how much light it emits. 
C)  Brightness is how bright the star appears to us; luminosity is how much light it emits. 
D)  Luminosity measures size; brightness measures temperature. 
A)  These are different names for the same property. 
B)  Luminosity is how bright the star appears to us; brightness is how much light it emits. 
C)  Brightness is how bright the star appears to us; luminosity is how much light it emits. 
D)  Luminosity measures size; brightness measures temperature.

Question 11

You observe a binary star system and find that star 1 has a velocity of 20 m/s while star 2 has a velocity of 40 m/s.What is the ratio of masses of the two stars (M₁/M₂)? If star 2 has a mass of 2 solar masses what is the mass of star 1?

Accepted Answer

The ratio of masses of stars i

Question 12

How are atoms excited,and why do they decay?

Accepted Answer

An atom becomes excited when an electron

Question 13

In a binary star system that contains stars with 10 M¤ and 5 M¤,the velocity of the 10 M¤ star will be ________ times the velocity of the 5 M¤ star.

Accepted Answer

A)  0.2 
B)  0.5 
C)  1 
D)  2 
A)  0.2 
B)  0.5 
C)  1 
D)  2

Question 14

How many arcseconds are there in a degree?

Accepted Answer

A)  60 
B)  360 
C)  3,600 
D)  6,000 
A)  60 
B)  360 
C)  3,600 
D)  6,000

Question 15

The Hertzsprung-Russell (H-R)diagram (see figure below)is a graph of:

Accepted Answer

A)  mass versus brightness for stars. 
B)  size versus mass for stars. 
C)  luminosity versus surface temperature for stars. 
D)  mass versus spectral type for stars. 
A)  mass versus brightness for stars. 
B)  size versus mass for stars. 
C)  luminosity versus surface temperature for stars. 
D)  mass versus spectral type for stars.

Question 16

Roughly what percentage of stars are main-sequence stars?

Accepted Answer

A)  10 percent 
B)  40 percent 
C)  60 percent 
D)  90 percent 
A)  10 percent 
B)  40 percent 
C)  60 percent 
D)  90 percent

Question 17

Why do O- and B-type stars have weaker hydrogen absorption lines than A-type stars?

Accepted Answer

A)  O- and B-type stars are cooler than A-type stars. 
B)  A larger fraction of the surface hydrogen atoms in O- and B-type stars is ionized. 
C)  O- and B-type stars have converted much more of their hydrogen into heavier elements. 
D)  A-type stars have a higher mass than O- and B-type stars, and they have more hydrogen. 
A)  O- and B-type stars are cooler than A-type stars. 
B)  A larger fraction of the surface hydrogen atoms in O- and B-type stars is ionized. 
C)  O- and B-type stars have converted much more of their hydrogen into heavier elements. 
D)  A-type stars have a higher mass than O- and B-type stars, and they have more hydrogen.

Question 18

Stars are made mostly of:

Accepted Answer

A)  helium. 
B)  oxygen. 
C)  hydrogen. 
D)  nitrogen. 
A)  helium. 
B)  oxygen. 
C)  hydrogen. 
D)  nitrogen.

Question 19

Examine the figure below.On a typical H-R diagram,where are main-sequence stars that have the hottest surface temperatures located?

Accepted Answer

A)  in the upper left corner 
B)  in the upper right corner 
C)  in the lower left corner 
D)  in the lower right corner 
A)  in the upper left corner 
B)  in the upper right corner 
C)  in the lower left corner 
D)  in the lower right corner

Question 20

Stars generally exhibit:

Accepted Answer

A)  an absorption spectrum. 
B)  a continuous spectrum. 
C)  an emission spectrum. 
D)  both emission and absorption spectra. 
A)  an absorption spectrum. 
B)  a continuous spectrum. 
C)  an emission spectrum. 
D)  both emission and absorption spectra.

Stars A and B appear equally bright,but star A is twice as far away from us as star B.Which of the following is true?

All of the following are useful in determining the masses of stars in a binary system EXCEPT:

Describe the luminosity classes found on the H-R diagram below.

If given the image alone in the figure below,what further information might be required to determine that the stars are a visual binary system?

Eclipsing binary systems:

What spectral class is the Sun?

How is the distance to a star related to its parallax?

In what ways are energy states of an atom like books occupying shelves in a bookcase?

Stars of similar temperatures but different sizes will have:

What is the difference between brightness and luminosity?

You observe a binary star system and find that star 1 has a velocity of 20 m/s while star 2 has a velocity of 40 m/s.What is the ratio of masses of the two stars (M₁/M₂)? If star 2 has a mass of 2 solar masses what is the mass of star 1?

How are atoms excited,and why do they decay?

In a binary star system that contains stars with 10 M¤ and 5 M¤,the velocity of the 10 M¤ star will be ________ times the velocity of the 5 M¤ star.

How many arcseconds are there in a degree?

The Hertzsprung-Russell (H-R)diagram (see figure below)is a graph of:

Roughly what percentage of stars are main-sequence stars?

Why do O- and B-type stars have weaker hydrogen absorption lines than A-type stars?

Stars are made mostly of:

Examine the figure below.On a typical H-R diagram,where are main-sequence stars that have the hottest surface temperatures located?

Stars generally exhibit:

Thinking Like an Astronomer

Patterns in the Skymotions of Earth and the Moon

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

Our Star: the Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Measuring Galaxies

Our Galaxy: the Milky Way

The Evolution of the Universe

Formation of Structure

Life in the Universe

Filters

Exam 10: Measuring the Stars

Stars A and B appear equally bright,but star A is twice as far away from us as star B.Which of the following is true?

All of the following are useful in determining the masses of stars in a binary system EXCEPT:

Describe the luminosity classes found on the H-R diagram below.

If given the image alone in the figure below,what further information might be required to determine that the stars are a visual binary system?

Eclipsing binary systems:

What spectral class is the Sun?

How is the distance to a star related to its parallax?

In what ways are energy states of an atom like books occupying shelves in a bookcase?

Stars of similar temperatures but different sizes will have:

What is the difference between brightness and luminosity?

You observe a binary star system and find that star 1 has a velocity of 20 m/s while star 2 has a velocity of 40 m/s.What is the ratio of masses of the two stars (M₁/M₂)? If star 2 has a mass of 2 solar masses what is the mass of star 1?

How are atoms excited,and why do they decay?

In a binary star system that contains stars with 10 M¤ and 5 M¤,the velocity of the 10 M¤ star will be ________ times the velocity of the 5 M¤ star.

How many arcseconds are there in a degree?

The Hertzsprung-Russell (H-R)diagram (see figure below)is a graph of:

Roughly what percentage of stars are main-sequence stars?

Why do O- and B-type stars have weaker hydrogen absorption lines than A-type stars?

Stars are made mostly of:

Examine the figure below.On a typical H-R diagram,where are main-sequence stars that have the hottest surface temperatures located?

Stars generally exhibit:

Thinking Like an Astronomer

Patterns in the Skymotions of Earth and the Moon

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

Our Star: the Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Measuring Galaxies

Our Galaxy: the Milky Way

The Evolution of the Universe

Formation of Structure

Life in the Universe

Filters