Question 1

Star A and Star B have the same size, but Star A is more luminous than Star B. Based on this information, which of the following must be the case?

Accepted Answer

A)  Star A is cooler than Star B. 
B)  Star A is hotter than Star B. 
C)  Star A and Star B have same temperature. 
D)  Star A is more massive than Star B. 
A)  Star A is cooler than Star B. 
B)  Star A is hotter than Star B. 
C)  Star A and Star B have same temperature. 
D)  Star A is more massive than Star B.

Question 2

What is the difference between spectroscopic and visual binaries?

Accepted Answer

A)  Spectroscopic binaries have double spectral lines but do not move. 
B)  Visual binaries are pairs of stars in the same region in the sky but are not gravitationally interacting. 
C)  A visual binary does not show changes in the spectral lines. 
D)  In a visual binary we can see two distinct stars; in spectroscopic binaries, the images of the two stars cannot be resolved. 
A)  Spectroscopic binaries have double spectral lines but do not move. 
B)  Visual binaries are pairs of stars in the same region in the sky but are not gravitationally interacting. 
C)  A visual binary does not show changes in the spectral lines. 
D)  In a visual binary we can see two distinct stars; in spectroscopic binaries, the images of the two stars cannot be resolved.

Question 3

The study of eclipsing binary stars is very important because it allows astronomers to determine

Accepted Answer

A)  the distance between two stars. 
B)  the speed of stars from the Doppler shift of their spectral lines. 
C)  the diameters of stars. 
D)  the luminosity of each star. 
E)  the brightness of each star. 
A)  the distance between two stars. 
B)  the speed of stars from the Doppler shift of their spectral lines. 
C)  the diameters of stars. 
D)  the luminosity of each star. 
E)  the brightness of each star.

Question 4

Which of the following stellar spectral types is cooler than our Sun?

Accepted Answer

A)  K 
B)  F 
C)  G 
D)  O 
A)  K 
B)  F 
C)  G 
D)  O

Question 5

If a main sequence, giant, and a supergiant all have the same spectral class, what characteristic is known to make these stars different?

Accepted Answer

A)  luminosity 
B)  distance 
C)  surface temperature 
D)  color 
E)  It shows that the more massive stars are cooler. 
A)  luminosity 
B)  distance 
C)  surface temperature 
D)  color 
E)  It shows that the more massive stars are cooler.

Question 6

Which of the following statements would explain the fact that larger molecules, such as amino acids, do not produce spectral lines in the OBAFGKM classification?

Accepted Answer

A)  Larger molecules require higher temperatures to show absorption lines. 
B)  The spectra of hydrogen and helium are sufficient to classify stars. 
C)  The spectra of larger molecules are too complicated. 
D)  Larger molecules break apart at the high temperatures of stellar atmospheres. 
E)  All of these choices are correct. 
A)  Larger molecules require higher temperatures to show absorption lines. 
B)  The spectra of hydrogen and helium are sufficient to classify stars. 
C)  The spectra of larger molecules are too complicated. 
D)  Larger molecules break apart at the high temperatures of stellar atmospheres. 
E)  All of these choices are correct.

Question 7

Which of the following is a main sequence star hotter than the Sun? (Note: the Sun is a G2V star.)

Accepted Answer

A)  K2V 
B)  G1II 
C)  G2III 
D)  G1V 
E)  O2II 
A)  K2V 
B)  G1II 
C)  G2III 
D)  G1V 
E)  O2II

Question 8

A star with an apparent magnitude of 10 is visible by the naked eye.

Accepted Answer

A) True 
 B)False

Question 9

A star has a parallax of 0.04 arc seconds. What is its distance?

Accepted Answer

A)  4 light-years 
B)  4 parsecs 
C)  25 light-years 
D)  25 parsecs 
A)  4 light-years 
B)  4 parsecs 
C)  25 light-years 
D)  25 parsecs

Question 10

The spectrum of a star shows the 656 nm absorption line shifted to 654 nm. Which of the following can we conclude about this star?

Accepted Answer

A)  The star is approaching us with an approximate speed of 1,800 km/sec. 
B)  The star is receding with an approximate speed of 1,800 km/sec. 
C)  The star is approaching us with an approximate speed of 900 km/sec. 
D)  The star is receding with an approximate speed of 900 km/sec. 
E)  The star is spinning rapidly. 
A)  The star is approaching us with an approximate speed of 1,800 km/sec. 
B)  The star is receding with an approximate speed of 1,800 km/sec. 
C)  The star is approaching us with an approximate speed of 900 km/sec. 
D)  The star is receding with an approximate speed of 900 km/sec. 
E)  The star is spinning rapidly.

Question 11

The amount of energy emitted by a star each second is the ______________ and is measured in ______________.

Accepted Answer

A)  apparent brightness; degrees K 
B)  temperature; degrees K 
C)  Apparent brightness; watts 
D)  luminosity; watts 
A)  apparent brightness; degrees K 
B)  temperature; degrees K 
C)  Apparent brightness; watts 
D)  luminosity; watts

Question 12

If a star has an apparent magnitude of 8 and an absolute magnitude of 6 it is

Accepted Answer

A)  much closer than 10 parsecs away. 
B)  slightly closer than 10 parsecs away. 
C)  exactly 10 parsecs away. 
D)  slightly farther than 10 parsecs away. 
E)  much farther than 10 parsecs away. 
A)  much closer than 10 parsecs away. 
B)  slightly closer than 10 parsecs away. 
C)  exactly 10 parsecs away. 
D)  slightly farther than 10 parsecs away. 
E)  much farther than 10 parsecs away.

Question 13

The masses of stars are generally in the range of 30 to 0.1 solar masses.

Accepted Answer

A) True 
 B)False

Question 14

A star with a spectrum that peaks at a wavelength of 1 micron (1 × 10-6) would have a surface temperature of _________ and be an __ star.

Accepted Answer

A)  2,900 K; O 
B)  2,900 K; M 
C)  29,000 K; O 
D)  29,000 K; M 
A)  2,900 K; O 
B)  2,900 K; M 
C)  29,000 K; O 
D)  29,000 K; M

Question 15

A star that is hot and has low luminosity must have ___________________.

Accepted Answer

A)  a very large radius 
B)  a very small radius 
C)  a very small mass 
D)  a very great distance 
E)  a very low velocity 
A)  a very large radius 
B)  a very small radius 
C)  a very small mass 
D)  a very great distance 
E)  a very low velocity

Question 16

A star of apparent magnitude 6 appears ___ times brighter than a star of apparent magnitude 7.

Accepted Answer

A)  1.00 
B)  13.0 
C)  2.51 
D)  0.5 
E)  10.0 
A)  1.00 
B)  13.0 
C)  2.51 
D)  0.5 
E)  10.0

Question 17

The luminosity of a star allows astronomers to determine the radius and distance of the star.

Accepted Answer

A) True 
 B)False

Question 18

In the H-R diagram, stars of luminosity class A1 are located near the center.

Accepted Answer

A) True 
 B)False

Question 19

Analysis of stellar spectra shows that most stars consist of 71% ___, 27% ___, and a 2% mix of the other elements.

Accepted Answer

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

Question 20

In the above H-R diagram, which main sequence star is reddish in color?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Star A and Star B have the same size, but Star A is more luminous than Star B. Based on this information, which of the following must be the case?

What is the difference between spectroscopic and visual binaries?

The study of eclipsing binary stars is very important because it allows astronomers to determine

Which of the following stellar spectral types is cooler than our Sun?

If a main sequence, giant, and a supergiant all have the same spectral class, what characteristic is known to make these stars different?

Which of the following statements would explain the fact that larger molecules, such as amino acids, do not produce spectral lines in the OBAFGKM classification?

Which of the following is a main sequence star hotter than the Sun? (Note: the Sun is a G2V star.)

A star with an apparent magnitude of 10 is visible by the naked eye.

A star has a parallax of 0.04 arc seconds. What is its distance?

The spectrum of a star shows the 656 nm absorption line shifted to 654 nm. Which of the following can we conclude about this star?

The amount of energy emitted by a star each second is the and is measured in .

If a star has an apparent magnitude of 8 and an absolute magnitude of 6 it is

The masses of stars are generally in the range of 30 to 0.1 solar masses.

A star with a spectrum that peaks at a wavelength of 1 micron (1 × 10^-6) would have a surface temperature of _______ and be an star.

A star that is hot and has low luminosity must have ___________________.

A star of apparent magnitude 6 appears ___ times brighter than a star of apparent magnitude 7.

The luminosity of a star allows astronomers to determine the radius and distance of the star.

In the H-R diagram, stars of luminosity class A1 are located near the center.

Analysis of stellar spectra shows that most stars consist of 71% _, 27% _, and a 2% mix of the other elements.

In the above H-R diagram, which main sequence star is reddish in color?

The Cycles of the Sky

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Exam 13: Measuring the Properties of Stars

Star A and Star B have the same size, but Star A is more luminous than Star B. Based on this information, which of the following must be the case?

What is the difference between spectroscopic and visual binaries?

The study of eclipsing binary stars is very important because it allows astronomers to determine

Which of the following stellar spectral types is cooler than our Sun?

If a main sequence, giant, and a supergiant all have the same spectral class, what characteristic is known to make these stars different?

Which of the following statements would explain the fact that larger molecules, such as amino acids, do not produce spectral lines in the OBAFGKM classification?

Which of the following is a main sequence star hotter than the Sun? (Note: the Sun is a G2V star.)

A star with an apparent magnitude of 10 is visible by the naked eye.

A star has a parallax of 0.04 arc seconds. What is its distance?

The spectrum of a star shows the 656 nm absorption line shifted to 654 nm. Which of the following can we conclude about this star?

The amount of energy emitted by a star each second is the ______________ and is measured in ______________.

If a star has an apparent magnitude of 8 and an absolute magnitude of 6 it is

The masses of stars are generally in the range of 30 to 0.1 solar masses.

A star with a spectrum that peaks at a wavelength of 1 micron (1 × 10-6) would have a surface temperature of _________ and be an __ star.

A star that is hot and has low luminosity must have ___________________.

A star of apparent magnitude 6 appears ___ times brighter than a star of apparent magnitude 7.

The luminosity of a star allows astronomers to determine the radius and distance of the star.

In the H-R diagram, stars of luminosity class A1 are located near the center.

Analysis of stellar spectra shows that most stars consist of 71% ___, 27% ___, and a 2% mix of the other elements.

In the above H-R diagram, which main sequence star is reddish in color?

The Cycles of the Sky

The Rise of Astronomy

Gravity and Motion

Light and Atoms

Telescopes

Earth

The Moon

Survey of Solar Systems

The Terrestrial Planets

The Outer Planets

Small Bodies Orbiting the Sun

The Sun, Our Star

Stellar Evolution

Stellar Remnants: White Dwarfs, Neutron Stars, and Black Holes

The Milky Way Galaxy

Galaxies

Cosmology

Filters

The amount of energy emitted by a star each second is the and is measured in .

A star with a spectrum that peaks at a wavelength of 1 micron (1 × 10^-6) would have a surface temperature of _______ and be an star.

Analysis of stellar spectra shows that most stars consist of 71% _, 27% _, and a 2% mix of the other elements.