Question 1

The Hertzsprung-Russell diagram (figure below)is:

Accepted Answer

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

Question 2

A parsec is a unit of time.

Accepted Answer

A) True 
 B)False  False

Question 3

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 D

Question 4

Two similar stars have the same temperature.If star A is four times brighter than star B then:

Accepted Answer

A)  star B is two times farther away than star A 
B)  star B is four times farther away than star A 
C)  star B and Star A lie at the same distance from us 
D)  it is impossible to determine their relative distances from the information given 
A)  star B is two times farther away than star A 
B)  star B is four times farther away than star A 
C)  star B and Star A lie at the same distance from us 
D)  it is impossible to determine their relative distances from the information given

Question 5

The emission and absorption lines of a given atom occur at the exact same energies.

Accepted Answer

A) True 
 B)False

Question 6

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 7

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 8

In a binary star system that contains stars with 2 M$\bigodot$ and 1 M$\bigodot$,the velocity of the 2 M$\bigodot$ star will be __________ times the velocity of the 1 M$\bigodot$ star.

Accepted Answer

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

Question 9

What is the difference between brightness and luminosity?

Accepted Answer

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

Question 10

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

Question 11

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 12

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 13

Describe how brightness,luminosity,and distance are related?

Accepted Answer

The brightness of a star is de

Question 14

The stars that have the largest radii are classified as:

Accepted Answer

A)  giants 
B)  ultragiants 
C)  supergiants 
D)  dwarfs 
A)  giants 
B)  ultragiants 
C)  supergiants 
D)  dwarfs

Question 15

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 16

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

By mass,the Sun is made up of

Question 17

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

Accepted Answer

Elements give off unique spect

Question 18

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 19

When looking at a standard H-R diagram,the hottest stars are on the left-hand side of the diagram.

Accepted Answer

A) True 
 B)False

Question 20

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

The Hertzsprung-Russell diagram (figure below)is:

A parsec is a unit of time.

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

Two similar stars have the same temperature.If star A is four times brighter than star B then:

The emission and absorption lines of a given atom occur at the exact same energies.

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 spectrum in the figure below is:

In a binary star system that contains stars with 2 M_$\bigodot$ and 1 M_$\bigodot$,the velocity of the 2 M_$\bigodot$ star will be __________ times the velocity of the 1 M_$\bigodot$ star.

What is the difference between brightness and luminosity?

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

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

Which star in the figure below is closest to Earth?

Describe how brightness,luminosity,and distance are related?

The stars that have the largest radii are classified as:

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?

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?

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

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

When looking at a standard H-R diagram,the hottest stars are on the left-hand side of the diagram.

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

Our Place in the Universe

Patterns in the Skymotions of Earth

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

The Expansion of Space

The Realm of the Galaxies

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

Exam 10: Measuring the Stars

The Hertzsprung-Russell diagram (figure below)is:

A parsec is a unit of time.

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

Two similar stars have the same temperature.If star A is four times brighter than star B then:

The emission and absorption lines of a given atom occur at the exact same energies.

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 spectrum in the figure below is:

In a binary star system that contains stars with 2 M ⨀\bigodot⨀ and 1 M ⨀\bigodot⨀ ,the velocity of the 2 M ⨀\bigodot⨀ star will be __________ times the velocity of the 1 M ⨀\bigodot⨀ star.

What is the difference between brightness and luminosity?

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

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

Which star in the figure below is closest to Earth?

Describe how brightness,luminosity,and distance are related?

The stars that have the largest radii are classified as:

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?

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?

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

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

When looking at a standard H-R diagram,the hottest stars are on the left-hand side of the diagram.

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

Our Place in the Universe

Patterns in the Skymotions of Earth

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

The Expansion of Space

The Realm of the Galaxies

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

In a binary star system that contains stars with 2 M_$\bigodot$ and 1 M_$\bigodot$,the velocity of the 2 M_$\bigodot$ star will be __________ times the velocity of the 1 M_$\bigodot$ star.