Question 1

When an electron moves from a higher energy level in an atom to a lower energy level:

Accepted Answer

A)  the atom is ionized. 
B)  a continuous spectrum is emitted. 
C)  a photon is emitted. 
D)  a photon is absorbed. 
A)  the atom is ionized. 
B)  a continuous spectrum is emitted. 
C)  a photon is emitted. 
D)  a photon is absorbed.

Question 2

Stars X and Y are 5 AU apart from each other.Star X is four times as massive as star Y.The center of mass of this system is ________ AU away from star X and ________ AU away from star Y.

Accepted Answer

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

Question 3

Examine the figure below.On a typical H-R diagram,where are main-sequence stars that have the coolest 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 4

Examine the figure below.Along the main sequence,how do the luminosity,temperature,radius,and mass of stars change as you go from the upper-left to the lower-right corners of the H-R diagram?

Accepted Answer

Stars near the upper-left end

Question 5

How is the unit of length known as a parsec defined?

Accepted Answer

The parsec is defined such tha

Question 6

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 7

To measure the parallax of the most distant stars measurable,we would make two measurements of the star's position separated by:

Accepted Answer

A)  6 hours. 
B)  12 hours. 
C)  6 months. 
D)  12 months. 
A)  6 hours. 
B)  12 hours. 
C)  6 months. 
D)  12 months.

Question 8

Describe how brightness,luminosity,and distance are related.

Accepted Answer

The brightness of a star is de

Question 9

The slower-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 10

Applying Kepler's third law to a binary star system allows us to determine:

Accepted Answer

A)  the mass of each star. 
B)  the system's total mass. 
C)  the system's distance. 
D)  the system's brightness. 
A)  the mass of each star. 
B)  the system's total mass. 
C)  the system's distance. 
D)  the system's brightness.

Question 11

You observe a binary star system and find that star 1 has a velocity of 10 m/s while star 2 has a velocity of 40 m/s.What is the ratio of masses of the two stars (M₁/M₂)?

Accepted Answer

The ratio of masses of stars i

Question 12

The spectral class of a star is related to its:

Accepted Answer

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

Question 13

You discover a binary star system in which star A has a velocity of 10 km/s and star B has a velocity of 30 km/s.Which one of the following mass combinations is physically possible?

Accepted Answer

A)  Star A is 3 M¤ and star B is 1 M¤. 
B)  Star A is 1 M¤ and star B is 0.3 M¤. 
C)  Star A is 1 M¤ and star B is 3 M¤. 
D)  Star A is 2 M¤ and star B is 0.5 M¤. 
A)  Star A is 3 M¤ and star B is 1 M¤. 
B)  Star A is 1 M¤ and star B is 0.3 M¤. 
C)  Star A is 1 M¤ and star B is 3 M¤. 
D)  Star A is 2 M¤ and star B is 0.5 M¤.

Question 14

A star classified as a K0III star is:

Accepted Answer

A)  a giant that is cooler than the Sun. 
B)  a supergiant that is hotter than the Sun. 
C)  a main-sequence star that is hotter than the Sun. 
D)  a subgiant that is cooler than the Sun. 
A)  a giant that is cooler than the Sun. 
B)  a supergiant that is hotter than the Sun. 
C)  a main-sequence star that is hotter than the Sun. 
D)  a subgiant that is cooler than the Sun.

Question 15

A star with a stellar parallax of 0.035 arcsec is at a distance of how many parsecs?

Accepted Answer

The inverse of stellar paralla

Question 16

The one property of a main-sequence star that determines all its other properties is its:

Accepted Answer

A)  luminosity. 
B)  mass. 
C)  temperature. 
D)  spectral type. 
A)  luminosity. 
B)  mass. 
C)  temperature. 
D)  spectral type.

Question 17

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.

When an electron moves from a higher energy level in an atom to a lower energy level:

Stars X and Y are 5 AU apart from each other.Star X is four times as massive as star Y.The center of mass of this system is AU away from star X and AU away from star Y.

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

Examine the figure below.Along the main sequence,how do the luminosity,temperature,radius,and mass of stars change as you go from the upper-left to the lower-right corners of the H-R diagram?

How is the unit of length known as a parsec defined?

The stars that have the largest radii are classified as:

To measure the parallax of the most distant stars measurable,we would make two measurements of the star's position separated by:

Describe how brightness,luminosity,and distance are related.

The slower-moving star in a binary is:

Applying Kepler's third law to a binary star system allows us to determine:

You observe a binary star system and find that star 1 has a velocity of 10 m/s while star 2 has a velocity of 40 m/s.What is the ratio of masses of the two stars (M₁/M₂)?

The spectral class of a star is related to its:

You discover a binary star system in which star A has a velocity of 10 km/s and star B has a velocity of 30 km/s.Which one of the following mass combinations is physically possible?

A star classified as a K0III star is:

A star with a stellar parallax of 0.035 arcsec is at a distance of how many parsecs?

The one property of a main-sequence star that determines all its other properties is its:

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

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

When an electron moves from a higher energy level in an atom to a lower energy level:

Stars X and Y are 5 AU apart from each other.Star X is four times as massive as star Y.The center of mass of this system is ________ AU away from star X and ________ AU away from star Y.

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

Examine the figure below.Along the main sequence,how do the luminosity,temperature,radius,and mass of stars change as you go from the upper-left to the lower-right corners of the H-R diagram?

How is the unit of length known as a parsec defined?

The stars that have the largest radii are classified as:

To measure the parallax of the most distant stars measurable,we would make two measurements of the star's position separated by:

Describe how brightness,luminosity,and distance are related.

The slower-moving star in a binary is:

Applying Kepler's third law to a binary star system allows us to determine:

You observe a binary star system and find that star 1 has a velocity of 10 m/s while star 2 has a velocity of 40 m/s.What is the ratio of masses of the two stars (M₁/M₂)?

The spectral class of a star is related to its:

You discover a binary star system in which star A has a velocity of 10 km/s and star B has a velocity of 30 km/s.Which one of the following mass combinations is physically possible?

A star classified as a K0III star is:

A star with a stellar parallax of 0.035 arcsec is at a distance of how many parsecs?

The one property of a main-sequence star that determines all its other properties is its:

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

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

Stars X and Y are 5 AU apart from each other.Star X is four times as massive as star Y.The center of mass of this system is AU away from star X and AU away from star Y.