Question 1

If a star were 25 parsecs away,it would have a parallax of how many arcseconds?

Accepted Answer

A)  0.04 
B)  0.25 
C)  4 
D)  25 
A)  0.04 
B)  0.25 
C)  4 
D)  25

Question 2

Two stars have the same spectral classification,say M2,but one is a red giant and the other is a main-sequence star.To determine which is which,we look at their spectra because the absorption lines in the giant will be

Accepted Answer

A)  narrower because of the pressure-broadening effect. 
B)  broader because of the pressure-broadening effect. 
C)  narrower because of the temperature difference between the two luminosity classes. 
D)  broader because of the temperature difference between the two luminosity classes. 
A)  narrower because of the pressure-broadening effect. 
B)  broader because of the pressure-broadening effect. 
C)  narrower because of the temperature difference between the two luminosity classes. 
D)  broader because of the temperature difference between the two luminosity classes.

Question 3

In the spectral classification of stars,strong absorption lines of which of the following atomic or molecular constituents would indicate very low surface temperature?

Accepted Answer

A)  He II 
B)  Fe II 
C)  Mg II 
D)  TiO 
A)  He II 
B)  Fe II 
C)  Mg II 
D)  TiO

Question 4

As you move upward and to the left on the H-R diagram,the stars become

Accepted Answer

A)  cooler and redder. 
B)  hotter and redder. 
C)  cooler and whiter. 
D)  hotter and whiter. 
A)  cooler and redder. 
B)  hotter and redder. 
C)  cooler and whiter. 
D)  hotter and whiter.

Question 5

Star A has a luminosity LA = 100 L and it is 1000 pc away.Star B has the same luminosity as the Sun,L,and it is 100 pc away.What can you say about the brightness of these two stars?

Accepted Answer

A)  Star A is brighter than Star B. 
B)  Star B is brighter than Star A. 
C)  Star A and Star B have the same brightness. 
D)  It is not possible to determine the answer without knowing L,the luminosity of the Sun. 
A)  Star A is brighter than Star B. 
B)  Star B is brighter than Star A. 
C)  Star A and Star B have the same brightness. 
D)  It is not possible to determine the answer without knowing L,the luminosity of the Sun.

Question 6

If the mass of a main-sequence star is greater than another,the

Accepted Answer

A)  luminosity would also be greater. 
B)  surface temperature would also be greater. 
C)  radius would also be greater. 
D)  luminosity,the surface temperature,and the radius would also be greater. 
A)  luminosity would also be greater. 
B)  surface temperature would also be greater. 
C)  radius would also be greater. 
D)  luminosity,the surface temperature,and the radius would also be greater.

Question 7

Stars of spectral type O,the hottest blue-white stars,have spectra characterized by

Accepted Answer

A)  the strongest hydrogen lines of any spectral type. 
B)  spectra of complex molecules. 
C)  very few spectral lines. 
D)  very intense spectral lines all across the spectrum. 
A)  the strongest hydrogen lines of any spectral type. 
B)  spectra of complex molecules. 
C)  very few spectral lines. 
D)  very intense spectral lines all across the spectrum.

Question 8

Which of the following atoms or ions will produce strong absorption lines in the spectra of stars with relatively cool surface temperatures?

Accepted Answer

A)  TiO,molecules of titanium oxide 
B)  He I,neutral helium 
C)  Mg II,ionized magnesium 
D)  Ca II,ionized calcium 
A)  TiO,molecules of titanium oxide 
B)  He I,neutral helium 
C)  Mg II,ionized magnesium 
D)  Ca II,ionized calcium

Question 9

The relative brightness of stars as we see them in our sky are represented on star charts in terms of their

Accepted Answer

A)  surface temperatures. 
B)  absolute magnitudes. 
C)  apparent magnitudes. 
D)  luminosities. 
A)  surface temperatures. 
B)  absolute magnitudes. 
C)  apparent magnitudes. 
D)  luminosities.

Question 10

Red stars are relatively cool compared with other stars,with low surface temperatures.

Accepted Answer

A) True 
 B)False

Question 11

An important aspect of binary star systems,as distinct from single stars,is that they allow a

Accepted Answer

A)  verification of the Doppler shift. 
B)  measurement of the overall shapes of stars. 
C)  measurement of the universal gravitational constant. 
D)  measurement of the masses of stars. 
A)  verification of the Doppler shift. 
B)  measurement of the overall shapes of stars. 
C)  measurement of the universal gravitational constant. 
D)  measurement of the masses of stars.

Question 12

What is stellar parallax and what stellar property can you determine from it?

Accepted Answer

Stellar parallax is the most straightfor

Question 13

What is the difference between absolute magnitude and apparent magnitude?

Accepted Answer

Apparent magnitude is how bright a star

Question 14

The point around which two stars of unequal mass in a binary system appear to revolve is

Accepted Answer

A)  closest to the more massive star. 
B)  halfway between the two star centers. 
C)  at the center of the more massive star. 
D)  closest to the less massive star. 
A)  closest to the more massive star. 
B)  halfway between the two star centers. 
C)  at the center of the more massive star. 
D)  closest to the less massive star.

Question 15

By analyzing a star's spectra,the chemical composition,the spectral type,and the luminosity class can be determined.

Accepted Answer

A) True 
 B)False

Question 16

How do you find the size of a star?

Accepted Answer

You can find a star's radius from its lu

Question 17

If stellar parallax can be measured to a precision of about 0.01 arcsec using telescopes on Earth to observe stars,to what distance does this correspond in space?

Accepted Answer

A)  500 pc 
B)  200 pc 
C)  100 pc 
D)  0.01 pc 
A)  500 pc 
B)  200 pc 
C)  100 pc 
D)  0.01 pc

Question 18

The star Alphard has an apparent magnitude of 2.0,and the star Megrez has an apparent magnitude of 3.3.The only thing that can be said with certainty about Alphard is that it

Accepted Answer

A)  is brighter than Megrez,as seen in our sky. 
B)  has a greater luminosity than Megrez. 
C)  is closer than Megrez. 
D)  is fainter than Megrez,as seen in our sky. 
A)  is brighter than Megrez,as seen in our sky. 
B)  has a greater luminosity than Megrez. 
C)  is closer than Megrez. 
D)  is fainter than Megrez,as seen in our sky.

Question 19

If two stars of different luminosity have the same temperature,a luminosity class III star will be smaller than a luminosity class I star.

Accepted Answer

A) True 
 B)False

Question 20

The relationship between mass and luminosity of stars on the main sequence is that

Accepted Answer

A)  the luminosity of stars rises to a peak at around a mass of 1 solar mass and decreases as mass increases beyond this limit. 
B)  the greater the stellar mass,the larger the luminosity. 
C)  luminosity is independent of the stellar mass. 
D)  the greater the stellar mass,the less the luminosity. 
A)  the luminosity of stars rises to a peak at around a mass of 1 solar mass and decreases as mass increases beyond this limit. 
B)  the greater the stellar mass,the larger the luminosity. 
C)  luminosity is independent of the stellar mass. 
D)  the greater the stellar mass,the less the luminosity.

If a star were 25 parsecs away,it would have a parallax of how many arcseconds?

Two stars have the same spectral classification,say M2,but one is a red giant and the other is a main-sequence star.To determine which is which,we look at their spectra because the absorption lines in the giant will be

In the spectral classification of stars,strong absorption lines of which of the following atomic or molecular constituents would indicate very low surface temperature?

As you move upward and to the left on the H-R diagram,the stars become

Star A has a luminosity L_A = 100 L and it is 1000 pc away.Star B has the same luminosity as the Sun,L,and it is 100 pc away.What can you say about the brightness of these two stars?

If the mass of a main-sequence star is greater than another,the

Stars of spectral type O,the hottest blue-white stars,have spectra characterized by

Which of the following atoms or ions will produce strong absorption lines in the spectra of stars with relatively cool surface temperatures?

The relative brightness of stars as we see them in our sky are represented on star charts in terms of their

Red stars are relatively cool compared with other stars,with low surface temperatures.

An important aspect of binary star systems,as distinct from single stars,is that they allow a

What is stellar parallax and what stellar property can you determine from it?

What is the difference between absolute magnitude and apparent magnitude?

The point around which two stars of unequal mass in a binary system appear to revolve is

By analyzing a star's spectra,the chemical composition,the spectral type,and the luminosity class can be determined.

How do you find the size of a star?

If stellar parallax can be measured to a precision of about 0.01 arcsec using telescopes on Earth to observe stars,to what distance does this correspond in space?

The star Alphard has an apparent magnitude of 2.0,and the star Megrez has an apparent magnitude of 3.3.The only thing that can be said with certainty about Alphard is that it

If two stars of different luminosity have the same temperature,a luminosity class III star will be smaller than a luminosity class I star.

The relationship between mass and luminosity of stars on the main sequence is that

Predicting the Motions of the Stars, Sun, and Moon

Decoding the Hidden Messages in Starlight

Analyzing Scales and Motions of the Universe

Exploring Our Evolving Solar System

Uncovering Earths Systems

Exploring Terrestrial Surface Processes and Atmospheres

Observing the Dynamic Giant Planets

Looking for Life Beyond Earth

Probing the Dynamic Sun

Inferring Patterns in Star Life Cycles

Predicting the Violent End of the Largest Stars

Exploring Our Galaxy

Investigating Other Galaxies

Observing the Evolution of the Universe

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Exam 10: Observing Properties of Distant Stars

If a star were 25 parsecs away,it would have a parallax of how many arcseconds?

Two stars have the same spectral classification,say M2,but one is a red giant and the other is a main-sequence star.To determine which is which,we look at their spectra because the absorption lines in the giant will be

In the spectral classification of stars,strong absorption lines of which of the following atomic or molecular constituents would indicate very low surface temperature?

As you move upward and to the left on the H-R diagram,the stars become

Star A has a luminosity LA = 100 L and it is 1000 pc away.Star B has the same luminosity as the Sun,L,and it is 100 pc away.What can you say about the brightness of these two stars?

If the mass of a main-sequence star is greater than another,the

Stars of spectral type O,the hottest blue-white stars,have spectra characterized by

Which of the following atoms or ions will produce strong absorption lines in the spectra of stars with relatively cool surface temperatures?

The relative brightness of stars as we see them in our sky are represented on star charts in terms of their

Red stars are relatively cool compared with other stars,with low surface temperatures.

An important aspect of binary star systems,as distinct from single stars,is that they allow a

What is stellar parallax and what stellar property can you determine from it?

What is the difference between absolute magnitude and apparent magnitude?

The point around which two stars of unequal mass in a binary system appear to revolve is

By analyzing a star's spectra,the chemical composition,the spectral type,and the luminosity class can be determined.

How do you find the size of a star?

If stellar parallax can be measured to a precision of about 0.01 arcsec using telescopes on Earth to observe stars,to what distance does this correspond in space?

The star Alphard has an apparent magnitude of 2.0,and the star Megrez has an apparent magnitude of 3.3.The only thing that can be said with certainty about Alphard is that it

If two stars of different luminosity have the same temperature,a luminosity class III star will be smaller than a luminosity class I star.

The relationship between mass and luminosity of stars on the main sequence is that

Predicting the Motions of the Stars, Sun, and Moon

Decoding the Hidden Messages in Starlight

Analyzing Scales and Motions of the Universe

Exploring Our Evolving Solar System

Uncovering Earths Systems

Exploring Terrestrial Surface Processes and Atmospheres

Observing the Dynamic Giant Planets

Looking for Life Beyond Earth

Probing the Dynamic Sun

Inferring Patterns in Star Life Cycles

Predicting the Violent End of the Largest Stars

Exploring Our Galaxy

Investigating Other Galaxies

Observing the Evolution of the Universe

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Star A has a luminosity L_A = 100 L and it is 1000 pc away.Star B has the same luminosity as the Sun,L,and it is 100 pc away.What can you say about the brightness of these two stars?