Question 1

Excluding the Sun,not a single star has an observed parallax greater than 1 arcsecond.

Accepted Answer

A) True 
 B)False

Question 2

The emission spectrum of a helium atom is identical to that of a carbon atom.

Accepted Answer

A) True 
 B)False

Question 3

Parallax is used to measure:

Accepted Answer

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

Question 4

The faster-moving star in a binary is:

Accepted Answer

A)  the less massive star 
B)  the more massive star 
C)  the hotter star 
D)  the more distant of the two stars 
A)  the less massive star 
B)  the more massive star 
C)  the hotter star 
D)  the more distant of the two stars

Question 5

It is not possible to detect a measurable parallax for even the closest stars without the use of a telescope.

Accepted Answer

A) True 
 B)False

Question 6

How many arcseconds are there in a degree?

Accepted Answer

A)  60 
B)  360 
C)  3,600 
D)  6,000 
A)  60 
B)  360 
C)  3,600 
D)  6,000

Question 7

In what ways are energy states of an atom like books occupying shelves in a bookcase?

Accepted Answer

Electrons can only occupy cert

Question 8

Spectra of the coolest stars show the largest amount of absorption from molecules like TiO and CN.

Accepted Answer

A) True 
 B)False

Question 9

Among main-sequence stars,the most massive stars are more luminous,redder,cooler,and have larger radii than less massive stars.

Accepted Answer

A) True 
 B)False

Question 10

The absolute magnitude of a star is a measure of its luminosity.

Accepted Answer

A) True 
 B)False

Question 11

Why do O- and B-type stars have weaker hydrogen absorption lines than A-type stars?

Accepted Answer

A)  O- and B-type stars are cooler than A-type stars. 
B)  A larger fraction of hydrogen atoms in O- and B-type stars is ionized. 
C)  O- and B-type stars have converted much more of their hydrogen into heavier elements. 
D)  A-type stars have a higher mass than O- and B-type stars and they have more hydrogen. 
A)  O- and B-type stars are cooler than A-type stars. 
B)  A larger fraction of hydrogen atoms in O- and B-type stars is ionized. 
C)  O- and B-type stars have converted much more of their hydrogen into heavier elements. 
D)  A-type stars have a higher mass than O- and B-type stars and they have more hydrogen.

Question 12

How are atoms excited and why do they decay?

Accepted Answer

An atom becomes excited when an electron

Question 13

A star with a stellar parallax of 0.025 arcseconds is at a distance of how many parsecs?

Accepted Answer

The inverse of stellar paralla

Question 14

An emission line is produced when an atom absorbs a photon of a specific energy.

Accepted Answer

A) True 
 B)False

Question 15

Stars of similar temperatures but different sizes:

Accepted Answer

A)  will have similar luminosities but different masses 
B)  will have similar masses but different distances 
C)  will have different spectral types but similar luminosities 
D)  will have similar spectral types but different luminosities 
A)  will have similar luminosities but different masses 
B)  will have similar masses but different distances 
C)  will have different spectral types but similar luminosities 
D)  will have similar spectral types but different luminosities

Excluding the Sun,not a single star has an observed parallax greater than 1 arcsecond.

The emission spectrum of a helium atom is identical to that of a carbon atom.

Parallax is used to measure:

The faster-moving star in a binary is:

It is not possible to detect a measurable parallax for even the closest stars without the use of a telescope.

How many arcseconds are there in a degree?

In what ways are energy states of an atom like books occupying shelves in a bookcase?

Spectra of the coolest stars show the largest amount of absorption from molecules like TiO and CN.

Among main-sequence stars,the most massive stars are more luminous,redder,cooler,and have larger radii than less massive stars.

The absolute magnitude of a star is a measure of its luminosity.

Why do O- and B-type stars have weaker hydrogen absorption lines than A-type stars?

How are atoms excited and why do they decay?

A star with a stellar parallax of 0.025 arcseconds is at a distance of how many parsecs?

An emission line is produced when an atom absorbs a photon of a specific energy.

Stars of similar temperatures but different sizes:

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

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Exam 10: Measuring the Stars

Excluding the Sun,not a single star has an observed parallax greater than 1 arcsecond.

The emission spectrum of a helium atom is identical to that of a carbon atom.

Parallax is used to measure:

The faster-moving star in a binary is:

It is not possible to detect a measurable parallax for even the closest stars without the use of a telescope.

How many arcseconds are there in a degree?

In what ways are energy states of an atom like books occupying shelves in a bookcase?

Spectra of the coolest stars show the largest amount of absorption from molecules like TiO and CN.

Among main-sequence stars,the most massive stars are more luminous,redder,cooler,and have larger radii than less massive stars.

The absolute magnitude of a star is a measure of its luminosity.

Why do O- and B-type stars have weaker hydrogen absorption lines than A-type stars?

How are atoms excited and why do they decay?

A star with a stellar parallax of 0.025 arcseconds is at a distance of how many parsecs?

An emission line is produced when an atom absorbs a photon of a specific energy.

Stars of similar temperatures but different sizes:

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