Question 1

Wien's law implies that a blue star is cooler than a red star.

Accepted Answer

A) True 
 B)False

Question 2

The study of eclipsing binary star systems provides information about the radii of stars.

Accepted Answer

A) True 
 B)False

Question 3

The parallax of a star is ____ usually measured in ____.

Accepted Answer

A)  a distance; arc seconds 
B)  an angle; arc seconds 
C)  an angle; parsecs 
D)  a distance; AUs 
A)  a distance; arc seconds 
B)  an angle; arc seconds 
C)  an angle; parsecs 
D)  a distance; AUs

Question 4

A visual binary star system has rotation period, P = 10 years. The semi-major axis of the orbit of one of the stars is 5 AU. What is the combined mass of the binary star system?

Accepted Answer

A)  0.4 solar masses 
B)  8 solar masses 
C)  4 solar masses 
D)  40 solar masses 
E)  200 solar masses 
A)  0.4 solar masses 
B)  8 solar masses 
C)  4 solar masses 
D)  40 solar masses 
E)  200 solar masses

Question 5

In what part of the H-R diagram are white dwarfs?

Accepted Answer

A)  upper left 
B)  lower center 
C)  upper right 
D)  lower right 
E)  just above the Sun on the main sequence 
A)  upper left 
B)  lower center 
C)  upper right 
D)  lower right 
E)  just above the Sun on the main sequence

Question 6

A star approaching Earth will show spectral lines that are shifted to longer wavelengths.

Accepted Answer

A) True 
 B)False

Question 7

A cool but very luminous star must have _______________.

Accepted Answer

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

Question 8

_____ can be used to measure the _____ of nearby stars.

Accepted Answer

A)  Parallax measurements; radius 
B)  The method of standard candles; brightness 
C)  Interferometry; radius 
D)  Spectroscopy; brightness 
A)  Parallax measurements; radius 
B)  The method of standard candles; brightness 
C)  Interferometry; radius 
D)  Spectroscopy; brightness

Question 9

Cooler, less luminous main sequence stars have _______________.

Accepted Answer

A)  higher masses 
B)  lower masses 
C)  the same masses as hotter stars 
D)  masses that vary widely 
A)  higher masses 
B)  lower masses 
C)  the same masses as hotter stars 
D)  masses that vary widely

Question 10

Which of the following stars is reddish in color?

Accepted Answer

A)  F6 
B)  A0 
C)  G5 
D)  B2 
E)  K9 
A)  F6 
B)  A0 
C)  G5 
D)  B2 
E)  K9

Question 11

A light source at a distance of 1 meter that emits 50 watts of visible radiation has the same _____________ as a source emitting 200 watts and is located ____________.

Accepted Answer

A)  luminosity; 2 meters away 
B)  luminosity; 4 meters away 
C)  apparent brightness; 2 meters away 
D)  apparent brightness; 4 meters away 
A)  luminosity; 2 meters away 
B)  luminosity; 4 meters away 
C)  apparent brightness; 2 meters away 
D)  apparent brightness; 4 meters away

Question 12

Differences in absolute magnitude correspond to ratios of ____.

Accepted Answer

A)  luminosity 
B)  brightness 
C)  mass 
D)  temperature 
E)  distance 
A)  luminosity 
B)  brightness 
C)  mass 
D)  temperature 
E)  distance

Question 13

The method of standard candles can be used to measure a star's ____.

Accepted Answer

A)  distance 
B)  luminosity 
C)  mass 
D)  brightness 
E)  absolute magnitude 
A)  distance 
B)  luminosity 
C)  mass 
D)  brightness 
E)  absolute magnitude

Question 14

What is a spectroscopic binary?

Accepted Answer

A)  a spectroscopic binary looks, to us on Earth, like a single star, but its spectrum shows double lines that shift 
B)  a visual binary for which we have spectra of both stars 
C)  a visual binary in which one or both stars have peculiar spectra 
D)  a visual binary that is shown by its spectrum to be a single star 
A)  a spectroscopic binary looks, to us on Earth, like a single star, but its spectrum shows double lines that shift 
B)  a visual binary for which we have spectra of both stars 
C)  a visual binary in which one or both stars have peculiar spectra 
D)  a visual binary that is shown by its spectrum to be a single star

Question 15

____ binary star systems are important because they allow astronomers to determine the mass and the ____ of the stars in the system.

Accepted Answer

A)  Eclipsing; temperature 
B)  Spectroscopic; diameter 
C)  Spectroscopic; temperature 
D)  Eclipsing; diameter 
E)  Visual; temperature 
A)  Eclipsing; temperature 
B)  Spectroscopic; diameter 
C)  Spectroscopic; temperature 
D)  Eclipsing; diameter 
E)  Visual; temperature

Question 16

Stars with surface temperatures near 10,000 K have the strongest hydrogen absorption lines in their spectra.

Accepted Answer

A) True 
 B)False

Question 17

In which binary system can we observe both the stars separately and follow their orbits around each other?

Accepted Answer

A)  visual binary system 
B)  spectroscopic binary system 
C)  eclipsing binary system 
D)  transiting binary system 
A)  visual binary system 
B)  spectroscopic binary system 
C)  eclipsing binary system 
D)  transiting binary system

Question 18

Why do stars have dark lines in their spectra?

Accepted Answer

A)  The cooler atoms in their surface layers absorb the radiation at some wavelengths. 
B)  They simply don't emit light at certain wavelengths. 
C)  Magnetic fields in Earth's atmosphere absorb the radiation at some wavelengths. 
D)  The statement is false. Stars have bright emission lines in their spectra, but no absorption lines. 
A)  The cooler atoms in their surface layers absorb the radiation at some wavelengths. 
B)  They simply don't emit light at certain wavelengths. 
C)  Magnetic fields in Earth's atmosphere absorb the radiation at some wavelengths. 
D)  The statement is false. Stars have bright emission lines in their spectra, but no absorption lines.

Question 19

Differences in apparent magnitude correspond to ratios of ____.

Accepted Answer

A)  luminosity 
B)  brightness 
C)  mass 
D)  temperature 
E)  distance 
A)  luminosity 
B)  brightness 
C)  mass 
D)  temperature 
E)  distance

Question 20

The star Aldebaran is cooler and much more luminous than the Sun. Where do you expect to find Aldebaran in the H-R diagram?

Accepted Answer

A)  top left 
B)  top right 
C)  center 
D)  bottom right 
E)  bottom left 
A)  top left 
B)  top right 
C)  center 
D)  bottom right 
E)  bottom left

Wien's law implies that a blue star is cooler than a red star.

The study of eclipsing binary star systems provides information about the radii of stars.

The parallax of a star is usually measured in .

A visual binary star system has rotation period, P = 10 years. The semi-major axis of the orbit of one of the stars is 5 AU. What is the combined mass of the binary star system?

In what part of the H-R diagram are white dwarfs?

A star approaching Earth will show spectral lines that are shifted to longer wavelengths.

A cool but very luminous star must have _______________.

_ can be used to measure the _ of nearby stars.

Cooler, less luminous main sequence stars have _______________.

Which of the following stars is reddish in color?

A light source at a distance of 1 meter that emits 50 watts of visible radiation has the same _ as a source emitting 200 watts and is located .

Differences in absolute magnitude correspond to ratios of ____.

The method of standard candles can be used to measure a star's ____.

What is a spectroscopic binary?

binary star systems are important because they allow astronomers to determine the mass and the of the stars in the system.

Stars with surface temperatures near 10,000 K have the strongest hydrogen absorption lines in their spectra.

In which binary system can we observe both the stars separately and follow their orbits around each other?

Why do stars have dark lines in their spectra?

Differences in apparent magnitude correspond to ratios of ____.

The star Aldebaran is cooler and much more luminous than the Sun. Where do you expect to find Aldebaran in the H-R diagram?

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

Exam 13: Measuring the Properties of Stars

Wien's law implies that a blue star is cooler than a red star.

The study of eclipsing binary star systems provides information about the radii of stars.

The parallax of a star is ____ usually measured in ____.

A visual binary star system has rotation period, P = 10 years. The semi-major axis of the orbit of one of the stars is 5 AU. What is the combined mass of the binary star system?

In what part of the H-R diagram are white dwarfs?

A star approaching Earth will show spectral lines that are shifted to longer wavelengths.

A cool but very luminous star must have _______________.

_____ can be used to measure the _____ of nearby stars.

Cooler, less luminous main sequence stars have _______________.

Which of the following stars is reddish in color?

A light source at a distance of 1 meter that emits 50 watts of visible radiation has the same _____________ as a source emitting 200 watts and is located ____________.

Differences in absolute magnitude correspond to ratios of ____.

The method of standard candles can be used to measure a star's ____.

What is a spectroscopic binary?

____ binary star systems are important because they allow astronomers to determine the mass and the ____ of the stars in the system.

Stars with surface temperatures near 10,000 K have the strongest hydrogen absorption lines in their spectra.

In which binary system can we observe both the stars separately and follow their orbits around each other?

Why do stars have dark lines in their spectra?

Differences in apparent magnitude correspond to ratios of ____.

The star Aldebaran is cooler and much more luminous than the Sun. Where do you expect to find Aldebaran in the H-R diagram?

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 parallax of a star is usually measured in .

_ can be used to measure the _ of nearby stars.

A light source at a distance of 1 meter that emits 50 watts of visible radiation has the same _ as a source emitting 200 watts and is located .

binary star systems are important because they allow astronomers to determine the mass and the of the stars in the system.