Question 1

-Use the H-R diagram to answer the following question: Which star in the diagram has the highest surface temperature?

Accepted Answer

A) Alnilam 
B) Antares 
C) Arcturus 
D) Sirius B 
A) Alnilam 
B) Antares 
C) Arcturus 
D) Sirius B A

Question 2

If you took a random sample of 100 main-sequence stars in the Sun's neighbourhood,what would you expect their total mass to be?

Accepted Answer

A) Much less than 1 solar mass. 
B) About 1 solar mass. 
C) About 10 solar masses. 
D) About 100 solar masses. 
A) Much less than 1 solar mass. 
B) About 1 solar mass. 
C) About 10 solar masses. 
D) About 100 solar masses. C

Question 3

Which stars have a large positive absolute magnitude?

Accepted Answer

A) stars of high luminosity 
B) stars of low luminosity 
C) nearby stars 
D) distant stars 
A) stars of high luminosity 
B) stars of low luminosity 
C) nearby stars 
D) distant stars B

Question 4

Based on the mass-luminosity relation,approximately what luminosity would a 2 solar mass star on the main sequence have?

Accepted Answer

A) 0.5 solar luminosities 
B) 2 solar luminosities 
C) 4 solar luminosities 
D) 11 solar luminosities 
A) 0.5 solar luminosities 
B) 2 solar luminosities 
C) 4 solar luminosities 
D) 11 solar luminosities

Question 5

The method of spectroscopic parallax cannot be applied to stars more that about 300 light years distant.

Accepted Answer

A) True 
 B)False

Question 6

If two stars are emitting the same amount of light,how will the star that is farther away appear?

Accepted Answer

A) brighter 
B) dimmer 
C) redder 
D) bluer 
A) brighter 
B) dimmer 
C) redder 
D) bluer

Question 7

How does density divide the stars in the H-R diagram into three groups?

Accepted Answer

The answer of How does density divide the stars in...

Question 8

The luminosity of a star is the total amount of energy it radiates each second.

Accepted Answer

A) True 
 B)False

Question 9

How is a luminosity class assigned to a star?

Accepted Answer

A) by combining the apparent magnitude with the star's parallax 
B) by measuring the period of variability in the star's apparent magnitude 
C) by studying the absorption line width in the spectrum of the star 
D) by observing the angular size of the star's image in a photograph or digital image 
A) by combining the apparent magnitude with the star's parallax 
B) by measuring the period of variability in the star's apparent magnitude 
C) by studying the absorption line width in the spectrum of the star 
D) by observing the angular size of the star's image in a photograph or digital image

Question 10

What properties of a star determine its luminosity?

Accepted Answer

A) distance and diameter 
B) temperature and distance 
C) temperature and diameter 
D) apparent magnitude and temperature 
A) distance and diameter 
B) temperature and distance 
C) temperature and diameter 
D) apparent magnitude and temperature

Question 11

The masses and diameters of each star in a binary can be determined from ____________________ binaries.

Accepted Answer

The answer of The masses and diameters of each star...

Question 12

Sirius A and B are two stars at the same distance from the Earth.In this binary system,Sirius A is much brighter but Sirius B is much hotter.From this information,what can you conclude about the two stars?

Accepted Answer

A) Sirius B must be much smaller than Sirius A. 
B) Sirius B must be much larger than Sirius A. 
C) Sirius B must be much more massive than Sirius A. 
D) Sirius B must be much less massive than Sirius A. 
A) Sirius B must be much smaller than Sirius A. 
B) Sirius B must be much larger than Sirius A. 
C) Sirius B must be much more massive than Sirius A. 
D) Sirius B must be much less massive than Sirius A.

Question 13

To determine the orbital period of a visual binary,what must we measure?

Accepted Answer

A) brightness 
B) position on the sky 
C) luminosity 
D) temperature 
A) brightness 
B) position on the sky 
C) luminosity 
D) temperature

Question 14

The most massive main-sequence stars are the M stars.

Accepted Answer

A) True 
 B)False

Question 15

If you compare two stars,which one will always have the greater luminosity?

Accepted Answer

A) The one with the larger radius will always have the greater luminosity. 
B) The one with the higher surface temperature will always have the greater luminosity. 
C) The one with the smaller absolute magnitude will always have the greater luminosity. 
D) The one with the largest distance will always have the greater luminosity. 
A) The one with the larger radius will always have the greater luminosity. 
B) The one with the higher surface temperature will always have the greater luminosity. 
C) The one with the smaller absolute magnitude will always have the greater luminosity. 
D) The one with the largest distance will always have the greater luminosity.

Question 16

In a binary system,where will the more massive star be found?

Accepted Answer

A) at the centre of mass 
B) farthest from the centre of mass 
C) nearest the centre of mass 
D) following the largest orbit 
A) at the centre of mass 
B) farthest from the centre of mass 
C) nearest the centre of mass 
D) following the largest orbit

Question 17

____________________ can be used to determine the distance to a star,when the spectrum of the star can be used to determine its spectral type and luminosity class.

Accepted Answer

Spectrosco

Question 18

The absolute magnitude of a star is the apparent magnitude it would have if it were 33 light years from Earth.

Accepted Answer

A) True 
 B)False

Question 19

The star named Sheat is of spectral type M2 and luminosity class II.Based on this information,how does Sheat compare to the Sun?

Accepted Answer

A) Sheat is cooler and larger than the Sun. 
B) Sheat is cooler and smaller than the Sun. 
C) Sheat is hotter and more luminous than the Sun. 
D) Sheat is hotter and larger than the Sun. 
A) Sheat is cooler and larger than the Sun. 
B) Sheat is cooler and smaller than the Sun. 
C) Sheat is hotter and more luminous than the Sun. 
D) Sheat is hotter and larger than the Sun.

Question 20

In an H-R diagram,where are the stars with the smallest radius found?

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

-Use the H-R diagram to answer the following question: Which star in the diagram has the highest surface temperature?

If you took a random sample of 100 main-sequence stars in the Sun's neighbourhood,what would you expect their total mass to be?

Which stars have a large positive absolute magnitude?

Based on the mass-luminosity relation,approximately what luminosity would a 2 solar mass star on the main sequence have?

The method of spectroscopic parallax cannot be applied to stars more that about 300 light years distant.

If two stars are emitting the same amount of light,how will the star that is farther away appear?

How does density divide the stars in the H-R diagram into three groups?

The luminosity of a star is the total amount of energy it radiates each second.

How is a luminosity class assigned to a star?

What properties of a star determine its luminosity?

The masses and diameters of each star in a binary can be determined from ____________________ binaries.

Sirius A and B are two stars at the same distance from the Earth.In this binary system,Sirius A is much brighter but Sirius B is much hotter.From this information,what can you conclude about the two stars?

To determine the orbital period of a visual binary,what must we measure?

The most massive main-sequence stars are the M stars.

If you compare two stars,which one will always have the greater luminosity?

In a binary system,where will the more massive star be found?

____________________ can be used to determine the distance to a star,when the spectrum of the star can be used to determine its spectral type and luminosity class.

The absolute magnitude of a star is the apparent magnitude it would have if it were 33 light years from Earth.

The star named Sheat is of spectral type M2 and luminosity class II.Based on this information,how does Sheat compare to the Sun?

In an H-R diagram,where are the stars with the smallest radius found?

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 Structure and Formation 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 6: The Family of Stars

-Use the H-R diagram to answer the following question: Which star in the diagram has the highest surface temperature?

If you took a random sample of 100 main-sequence stars in the Sun's neighbourhood,what would you expect their total mass to be?

Which stars have a large positive absolute magnitude?

Based on the mass-luminosity relation,approximately what luminosity would a 2 solar mass star on the main sequence have?

The method of spectroscopic parallax cannot be applied to stars more that about 300 light years distant.

If two stars are emitting the same amount of light,how will the star that is farther away appear?

How does density divide the stars in the H-R diagram into three groups?

The luminosity of a star is the total amount of energy it radiates each second.

How is a luminosity class assigned to a star?

What properties of a star determine its luminosity?

The masses and diameters of each star in a binary can be determined from ____________________ binaries.

Sirius A and B are two stars at the same distance from the Earth.In this binary system,Sirius A is much brighter but Sirius B is much hotter.From this information,what can you conclude about the two stars?

To determine the orbital period of a visual binary,what must we measure?

The most massive main-sequence stars are the M stars.

If you compare two stars,which one will always have the greater luminosity?

In a binary system,where will the more massive star be found?

____________________ can be used to determine the distance to a star,when the spectrum of the star can be used to determine its spectral type and luminosity class.

The absolute magnitude of a star is the apparent magnitude it would have if it were 33 light years from Earth.

The star named Sheat is of spectral type M2 and luminosity class II.Based on this information,how does Sheat compare to the Sun?

In an H-R diagram,where are the stars with the smallest radius found?

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 Structure and Formation 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