Question 1

On the main sequence on an H-R diagram, our Sun lies at about ________.

Accepted Answer

the center

Question 2

How might the most common occurring stars be described, based on our stellar neighborhood?

Accepted Answer

A)  White dwarfs 
B)  K giants 
C)  G main sequence 
D)  A main sequence 
E)  M main sequence 
A)  White dwarfs 
B)  K giants 
C)  G main sequence 
D)  A main sequence 
E)  M main sequence E

Question 3

On the H-R diagram, red supergiants like Betelgeuse lie

Accepted Answer

A)  at the bottom left. 
B)  at the bottom right. 
C)  at the top left. 
D)  at the top right. 
E)  They can't be plotted, for they are not main sequence. 
A)  at the bottom left. 
B)  at the bottom right. 
C)  at the top left. 
D)  at the top right. 
E)  They can't be plotted, for they are not main sequence. D

Question 4

If a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's

Accepted Answer

A)  transverse motion. 
B)  radial motion. 
C)  parallax shift. 
D)  Doppler shift. 
E)  true space motion. 
A)  transverse motion. 
B)  radial motion. 
C)  parallax shift. 
D)  Doppler shift. 
E)  true space motion.

Question 5

In order to turn a star's proper motion into its space velocity, we must also know

Accepted Answer

A)  its mass and spectral type. 
B)  its temperature and age. 
C)  its distance and radial velocity. 
D)  its distance and mass. 
E)  its spectral type and period of rotation. 
A)  its mass and spectral type. 
B)  its temperature and age. 
C)  its distance and radial velocity. 
D)  its distance and mass. 
E)  its spectral type and period of rotation.

Question 6

Stars that have masses similar to the Sun's, and sizes similar to the Earth are

Accepted Answer

A)  main sequence stars. 
B)  white dwarfs. 
C)  red giants. 
D)  red dwarfs. 
E)  brown dwarfs. 
A)  main sequence stars. 
B)  white dwarfs. 
C)  red giants. 
D)  red dwarfs. 
E)  brown dwarfs.

Question 7

For luminosity classification, fat stars have skinny spectral lines.

Accepted Answer

A) True 
 B)False

Question 8

First magnitude Spica appears 2.5 times brighter than second magnitude Polaris.

Accepted Answer

A) True 
 B)False

Question 9

The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.

Accepted Answer

A)  distance 
B)  luminosity or absolute magnitude 
C)  brightness or apparent magnitude 
D)  size or density 
E)  mass 
A)  distance 
B)  luminosity or absolute magnitude 
C)  brightness or apparent magnitude 
D)  size or density 
E)  mass

Question 10

Knowledge of a star's temperature and ________ enables us to calculate its radius, surface area, and volume from the appropriate radiation law.

Accepted Answer

luminosity

Question 11

The ________ magnitude of a star depends directly upon its luminosity and distance.

Accepted Answer

The answer of The ________ magnitude of a star depends...

Question 12

Hydrogen lines are weaker in both very hot and very cool stars.

Accepted Answer

A) True 
 B)False

Question 13

A nearby star has a parallax of 0.2 arc seconds. What is its distance?

Accepted Answer

A)  0.1 parsec 
B)  0.2 parsec 
C)  0.5 parsec 
D)  5 parsecs 
E)  50 parsecs 
A)  0.1 parsec 
B)  0.2 parsec 
C)  0.5 parsec 
D)  5 parsecs 
E)  50 parsecs

Question 14

Upon what data do measurements of sizes of eclipsing binaries depend?

Accepted Answer

A)  Their orbital periods and separations 
B)  Their masses and luminosities 
C)  Their Doppler shifts and durations of stages of their eclipses 
D)  Their temperatures and speeds 
E)  Their temperatures and masses 
A)  Their orbital periods and separations 
B)  Their masses and luminosities 
C)  Their Doppler shifts and durations of stages of their eclipses 
D)  Their temperatures and speeds 
E)  Their temperatures and masses

Question 15

Roughly how many stars are within 4 parsecs of the solar system?

Accepted Answer

A)  3 
B)  30 
C)  3000 
D)  300,000 
E)  200 billion 
A)  3 
B)  30 
C)  3000 
D)  300,000 
E)  200 billion

Question 16

Two stars have apparent magnitudes of 0 and 5. If both stars are 117 parsecs away, which star is intrinsically brighter and by what factor is it brighter than the other?

Accepted Answer

Since both stars are at the same distanc

Question 17

The vast majority of stars near us would fall to the bottom right on the H-R diagram.

Accepted Answer

A) True 
 B)False

Question 18

Procyon lies about 13 light-years distant, thus its parallax is about

Accepted Answer

A)  0.01". 
B)  0.25". 
C)  0.40". 
D)  0.65". 
E)  1.3". 
A)  0.01". 
B)  0.25". 
C)  0.40". 
D)  0.65". 
E)  1.3".

Question 19

Star A and star B both have an absolute magnitude of 2.0, but star A is at a distance of 50 pc and star B is at a distance of 20 pc. Which statement below is correct?

Accepted Answer

A)  Star A appears brighter than star B, but star B and star A have the same intrinsic brightness. 
B)  Star B appears brighter than star A, but star B and star A have the same intrinsic brightness. 
C)  Star A and star B appear to have the same brightness, but star B is intrinsically brighter than star A. 
D)  Star A and star B appear to have the same brightness, but star A is intrinsically brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above. 
A)  Star A appears brighter than star B, but star B and star A have the same intrinsic brightness. 
B)  Star B appears brighter than star A, but star B and star A have the same intrinsic brightness. 
C)  Star A and star B appear to have the same brightness, but star B is intrinsically brighter than star A. 
D)  Star A and star B appear to have the same brightness, but star A is intrinsically brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.

Question 20

What types of observations are necessary to determine the absolute luminosity of a star?

Accepted Answer

The absolute luminosity of a star, or ab

On the main sequence on an H-R diagram, our Sun lies at about ________.

How might the most common occurring stars be described, based on our stellar neighborhood?

On the H-R diagram, red supergiants like Betelgeuse lie

If a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's

In order to turn a star's proper motion into its space velocity, we must also know

Stars that have masses similar to the Sun's, and sizes similar to the Earth are

For luminosity classification, fat stars have skinny spectral lines.

First magnitude Spica appears 2.5 times brighter than second magnitude Polaris.

The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.

Knowledge of a star's temperature and ________ enables us to calculate its radius, surface area, and volume from the appropriate radiation law.

The ________ magnitude of a star depends directly upon its luminosity and distance.

Hydrogen lines are weaker in both very hot and very cool stars.

A nearby star has a parallax of 0.2 arc seconds. What is its distance?

Upon what data do measurements of sizes of eclipsing binaries depend?

Roughly how many stars are within 4 parsecs of the solar system?

Two stars have apparent magnitudes of 0 and 5. If both stars are 117 parsecs away, which star is intrinsically brighter and by what factor is it brighter than the other?

The vast majority of stars near us would fall to the bottom right on the H-R diagram.

Procyon lies about 13 light-years distant, thus its parallax is about

Star A and star B both have an absolute magnitude of 2.0, but star A is at a distance of 50 pc and star B is at a distance of 20 pc. Which statement below is correct?

What types of observations are necessary to determine the absolute luminosity of a star?

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Galaxies

Cosmology and the Universe

Filters

Exam 9: Measuring the Stars

On the main sequence on an H-R diagram, our Sun lies at about ________.

How might the most common occurring stars be described, based on our stellar neighborhood?

On the H-R diagram, red supergiants like Betelgeuse lie

If a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's

In order to turn a star's proper motion into its space velocity, we must also know

Stars that have masses similar to the Sun's, and sizes similar to the Earth are

For luminosity classification, fat stars have skinny spectral lines.

First magnitude Spica appears 2.5 times brighter than second magnitude Polaris.

The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.

Knowledge of a star's temperature and ________ enables us to calculate its radius, surface area, and volume from the appropriate radiation law.

The ________ magnitude of a star depends directly upon its luminosity and distance.

Hydrogen lines are weaker in both very hot and very cool stars.

A nearby star has a parallax of 0.2 arc seconds. What is its distance?

Upon what data do measurements of sizes of eclipsing binaries depend?

Roughly how many stars are within 4 parsecs of the solar system?

Two stars have apparent magnitudes of 0 and 5. If both stars are 117 parsecs away, which star is intrinsically brighter and by what factor is it brighter than the other?

The vast majority of stars near us would fall to the bottom right on the H-R diagram.

Procyon lies about 13 light-years distant, thus its parallax is about

Star A and star B both have an absolute magnitude of 2.0, but star A is at a distance of 50 pc and star B is at a distance of 20 pc. Which statement below is correct?

What types of observations are necessary to determine the absolute luminosity of a star?

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Galaxies

Cosmology and the Universe

Filters