Question 1

If a star's distance is 100 pc,what is its parallax?

Accepted Answer

A)  0.01 arcsec 
B)  0.05 arcsec 
C)  0.1 arcsec 
D)  0.5 arcsec 
A)  0.01 arcsec 
B)  0.05 arcsec 
C)  0.1 arcsec 
D)  0.5 arcsec

Question 2

The spectrum in the figure below is:

Accepted Answer

A)  an absorption spectrum. 
B)  an emission spectrum. 
C)  a thermal spectrum. 
D)  not any of these types. 
A)  an absorption spectrum. 
B)  an emission spectrum. 
C)  a thermal spectrum. 
D)  not any of these types.

Question 3

What is the main property of a main-sequence star that determines nearly all its other properties?

Accepted Answer

The star's mass has

Question 4

What is the spectral type of stars that have the strongest hydrogen absorption lines? Why do stars that are hotter than these have weaker hydrogen lines?

Accepted Answer

A-type stars have the strongest hydrogen

Question 5

On a typical H-R diagram,where are the largest stars 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 6

The luminosity class of a star is related to its:

Accepted Answer

A)  distance. 
B)  temperature. 
C)  radius. 
D)  mass. 
A)  distance. 
B)  temperature. 
C)  radius. 
D)  mass.

Question 7

Star A is a red star.Star B is a blue star.Which is hotter?

Accepted Answer

A)  star A 
B)  star B 
C)  We also need to know the luminosities of the stars to determine their temperatures. 
D)  Color is not related to temperature at all. 
A)  star A 
B)  star B 
C)  We also need to know the luminosities of the stars to determine their temperatures. 
D)  Color is not related to temperature at all.

Question 8

Using information from the figure below,explain why star 2 is the more massive star of the eclipsing binary pair?

Accepted Answer

Star 2 exhibits the

Question 9

Which of the following properties is never plotted on the horizontal axis of an H-R diagram?

Accepted Answer

A)  color 
B)  luminosity 
C)  temperature 
D)  spectral class 
A)  color 
B)  luminosity 
C)  temperature 
D)  spectral class

Question 10

Why do we see black lines in an absorption spectrum if the absorbed photons are (almost)instantaneously reemitted by the atoms in the cloud?

Accepted Answer

Originally all the light was traveling i

Question 11

The star named Capella has an apparent magnitude of 0 while the star named Polaris has an apparent magnitude of 2,which means that Capella appears ________ Polaris in the night sky.

Accepted Answer

A)  brighter than 
B)  as bright as 
C)  dimmer than 
A)  brighter than 
B)  as bright as 
C)  dimmer than

Question 12

How do astronomers use spectra to determine the composition of a star?

Accepted Answer

Elements emit or absorb unique

Question 13

Parallax is used to directly measure:

Accepted Answer

A)  distance. 
B)  velocity. 
C)  luminosity. 
D)  mass. 
A)  distance. 
B)  velocity. 
C)  luminosity. 
D)  mass.

Question 14

Which star in the figure below is closest to Earth?

Accepted Answer

A)  star A 
B)  star B 
C)  The two stars are the same distance. 
D)  not enough information 
A)  star A 
B)  star B 
C)  The two stars are the same distance. 
D)  not enough information

Question 15

In the quantum mechanical view of the atom,an electron is best thought of as:

Accepted Answer

A)  a cloud that is centered on the nucleus. 
B)  a pointlike particle orbiting the nucleus. 
C)  free to orbit at any distance from the nucleus. 
D)  All of the above are true. 
A)  a cloud that is centered on the nucleus. 
B)  a pointlike particle orbiting the nucleus. 
C)  free to orbit at any distance from the nucleus. 
D)  All of the above are true.

Question 16

Explain how we can use spectroscopic parallax to determine the distance to a star farther away than a few hundred light-years.

Accepted Answer

First,we can determine the temperature o

Question 17

If a star's measured parallax is 0.1 arcsec,what is its distance?

Accepted Answer

A)  1 pc 
B)  5 pc 
C)  10 pc 
D)  50 pc 
A)  1 pc 
B)  5 pc 
C)  10 pc 
D)  50 pc

Question 18

Which sequence correctly lists the spectral classes of stars in order of decreasing temperature (from hottest to coolest)?

Accepted Answer

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

Question 19

Examine the figure below.On a typical H-R diagram,what are the stars that have the hottest surface temperatures and the smallest radii?

Accepted Answer

A)  red giants 
B)  blue giants 
C)  red dwarfs 
D)  white dwarfs 
A)  red giants 
B)  blue giants 
C)  red dwarfs 
D)  white dwarfs

Question 20

What are the two main chemical elements that make up the Sun? How much of the mass of the Sun is composed of elements other than these two?

Accepted Answer

Typically,more than 90 percent of the at

If a star's distance is 100 pc,what is its parallax?

The spectrum in the figure below is:

What is the main property of a main-sequence star that determines nearly all its other properties?

What is the spectral type of stars that have the strongest hydrogen absorption lines? Why do stars that are hotter than these have weaker hydrogen lines?

On a typical H-R diagram,where are the largest stars located?

The luminosity class of a star is related to its:

Star A is a red star.Star B is a blue star.Which is hotter?

Using information from the figure below,explain why star 2 is the more massive star of the eclipsing binary pair?

Which of the following properties is never plotted on the horizontal axis of an H-R diagram?

Why do we see black lines in an absorption spectrum if the absorbed photons are (almost)instantaneously reemitted by the atoms in the cloud?

The star named Capella has an apparent magnitude of 0 while the star named Polaris has an apparent magnitude of 2,which means that Capella appears ________ Polaris in the night sky.

How do astronomers use spectra to determine the composition of a star?

Parallax is used to directly measure:

Which star in the figure below is closest to Earth?

In the quantum mechanical view of the atom,an electron is best thought of as:

Explain how we can use spectroscopic parallax to determine the distance to a star farther away than a few hundred light-years.

If a star's measured parallax is 0.1 arcsec,what is its distance?

Which sequence correctly lists the spectral classes of stars in order of decreasing temperature (from hottest to coolest)?

Examine the figure below.On a typical H-R diagram,what are the stars that have the hottest surface temperatures and the smallest radii?

What are the two main chemical elements that make up the Sun? How much of the mass of the Sun is composed of elements other than these two?

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

If a star's distance is 100 pc,what is its parallax?

The spectrum in the figure below is:

What is the main property of a main-sequence star that determines nearly all its other properties?

What is the spectral type of stars that have the strongest hydrogen absorption lines? Why do stars that are hotter than these have weaker hydrogen lines?

On a typical H-R diagram,where are the largest stars located?

The luminosity class of a star is related to its:

Star A is a red star.Star B is a blue star.Which is hotter?

Using information from the figure below,explain why star 2 is the more massive star of the eclipsing binary pair?

Which of the following properties is never plotted on the horizontal axis of an H-R diagram?

Why do we see black lines in an absorption spectrum if the absorbed photons are (almost)instantaneously reemitted by the atoms in the cloud?

The star named Capella has an apparent magnitude of 0 while the star named Polaris has an apparent magnitude of 2,which means that Capella appears ________ Polaris in the night sky.

How do astronomers use spectra to determine the composition of a star?

Parallax is used to directly measure:

Which star in the figure below is closest to Earth?

In the quantum mechanical view of the atom,an electron is best thought of as:

Explain how we can use spectroscopic parallax to determine the distance to a star farther away than a few hundred light-years.

If a star's measured parallax is 0.1 arcsec,what is its distance?

Which sequence correctly lists the spectral classes of stars in order of decreasing temperature (from hottest to coolest)?

Examine the figure below.On a typical H-R diagram,what are the stars that have the hottest surface temperatures and the smallest radii?

What are the two main chemical elements that make up the Sun? How much of the mass of the Sun is composed of elements other than these two?

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