Question 1

How do absorption lines from interstellar gas compare to absorption lines from stars?

Accepted Answer

A) They are wider than the lines from stars because the gas is hotter than most stars. 
B) They are narrower than the lines from stars because the gas has a lower pressure than stars. 
C) They indicate that the interstellar medium contains different elements than stars do. 
D) They indicate that interstellar medium clouds have high velocities. 
A) They are wider than the lines from stars because the gas is hotter than most stars. 
B) They are narrower than the lines from stars because the gas has a lower pressure than stars. 
C) They indicate that the interstellar medium contains different elements than stars do. 
D) They indicate that interstellar medium clouds have high velocities.

Question 2

What does solving equations on a computer have to do with making a stellar model?

Accepted Answer

A) The equations apply the laws of stellar structure at locations within the star. 
B) Equations can describe the H-R diagram and a star's location on it. 
C) The mass-luminosity equation tells you how to find a star's luminosity given its mass. 
D) Equations are used to model the nuclear reactions inside a star. 
A) The equations apply the laws of stellar structure at locations within the star. 
B) Equations can describe the H-R diagram and a star's location on it. 
C) The mass-luminosity equation tells you how to find a star's luminosity given its mass. 
D) Equations are used to model the nuclear reactions inside a star.

Question 3

What observations indicate the presence of dust in the interstellar medium?

Accepted Answer

The presence of dust in the interstellar

Question 4

What is the name of the process by which the Sun turns mass into energy?

Accepted Answer

A) nuclear fission 
B) nuclear fusion 
C) convection 
D) radiation 
A) nuclear fission 
B) nuclear fusion 
C) convection 
D) radiation

Question 5

What is produced in the proton-proton chain?

Accepted Answer

A) two hydrogen nuclei, a single helium nucleus and energy in the form of visible light 
B) four hydrogen nuclei and energy in the form of gamma rays 
C) a helium nucleus and energy in the form of gamma rays 
D) two hydrogen nuclei and energy in the form of visible light 
A) two hydrogen nuclei, a single helium nucleus and energy in the form of visible light 
B) four hydrogen nuclei and energy in the form of gamma rays 
C) a helium nucleus and energy in the form of gamma rays 
D) two hydrogen nuclei and energy in the form of visible light

Question 6

Energy transport by ____________________ is important when photons cannot readily travel through a gas.

Accepted Answer

The answer of Energy transport by ____________________ is important when...

Question 7

How does the temperature inside a star determine how energy flows inside it?

Accepted Answer

A) The radiation rate depends on temperature. 
B) The dependence of opacity on temperature makes convection happen. 
C) The dependence of opacity on temperature makes conduction happen. 
D) The temperature determines how much energy is produced at each layer. 
A) The radiation rate depends on temperature. 
B) The dependence of opacity on temperature makes convection happen. 
C) The dependence of opacity on temperature makes conduction happen. 
D) The temperature determines how much energy is produced at each layer.

Question 8

-On this H-R diagram,the line indicates the location of the main sequence.Which of the four labelled locations on the H-R diagram indicates a luminosity and temperature similar to that of a T Tauri star?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 9

Where are stars born?

Accepted Answer

A) reflection nebulae 
B) dense molecular clouds 
C) HII regions 
D) the intercloud medium 
A) reflection nebulae 
B) dense molecular clouds 
C) HII regions 
D) the intercloud medium

Question 10

____________________ is the resistance of a gas to the flow of radiation.

Accepted Answer

The answer of ____________________ is the resistance of a gas...

Question 11

The pressure of a gas depends on the temperature and density of the gas.

Accepted Answer

A) True 
 B)False

Question 12

Why do astronomers use the molecule CO,instead of hydrogen,to map molecular clouds?

Accepted Answer

Astronomers use the molecule carbon mono

How do absorption lines from interstellar gas compare to absorption lines from stars?

What does solving equations on a computer have to do with making a stellar model?

What observations indicate the presence of dust in the interstellar medium?

What is the name of the process by which the Sun turns mass into energy?

What is produced in the proton-proton chain?

Energy transport by ____________________ is important when photons cannot readily travel through a gas.

How does the temperature inside a star determine how energy flows inside it?

-On this H-R diagram,the line indicates the location of the main sequence.Which of the four labelled locations on the H-R diagram indicates a luminosity and temperature similar to that of a T Tauri star?

Where are stars born?

____________________ is the resistance of a gas to the flow of radiation.

The pressure of a gas depends on the temperature and density of the gas.

Why do astronomers use the molecule CO,instead of hydrogen,to map molecular clouds?

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters

Exam 7: The Structure and Formation of Stars

How do absorption lines from interstellar gas compare to absorption lines from stars?

What does solving equations on a computer have to do with making a stellar model?

What observations indicate the presence of dust in the interstellar medium?

What is the name of the process by which the Sun turns mass into energy?

What is produced in the proton-proton chain?

Energy transport by ____________________ is important when photons cannot readily travel through a gas.

How does the temperature inside a star determine how energy flows inside it?

-On this H-R diagram,the line indicates the location of the main sequence.Which of the four labelled locations on the H-R diagram indicates a luminosity and temperature similar to that of a T Tauri star?

Where are stars born?

____________________ is the resistance of a gas to the flow of radiation.

The pressure of a gas depends on the temperature and density of the gas.

Why do astronomers use the molecule CO,instead of hydrogen,to map molecular clouds?

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters