Question 1

The luminosity class of a star can be determined from the width of the spectral lines of the star.

Accepted Answer

A) True 
 B)False  True

Question 2

Analysis of ___ stars has shown that star masses are in the range of ___ to ____ solar masses.

Accepted Answer

A)  binary; 1; 10 
B)  spinning; 1,000; 0.1 
C)  binary; 100; 1 
D)  spinning; 1; 100 
E)  binary; 30; 0.1 
A)  binary; 1; 10 
B)  spinning; 1,000; 0.1 
C)  binary; 100; 1 
D)  spinning; 1; 100 
E)  binary; 30; 0.1 E

Question 3

What is parallax?

Accepted Answer

A)  the distance to an object, measured in parsecs 
B)  the difference between the apparent and absolute magnitude 
C)  the apparent shift in position of an object caused by a change in the observer's position 
D)  the shift in angular position of an object as the object actually moves in space 
A)  the distance to an object, measured in parsecs 
B)  the difference between the apparent and absolute magnitude 
C)  the apparent shift in position of an object caused by a change in the observer's position 
D)  the shift in angular position of an object as the object actually moves in space C

Question 4

A star radiates most strongly at 600 nanometers. What is its surface temperature?

Accepted Answer

A)  483 K 
B)  4,830 K 
C)  6,000 K 
D)  72,500 K 
E)  7,250 K 
A)  483 K 
B)  4,830 K 
C)  6,000 K 
D)  72,500 K 
E)  7,250 K

Question 5

In the above H-R diagram sketch, which star is a red giant?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 6

If Star A is twice as far as Star B, and they are identical in all other ways, then the brightness of Star A would be

Accepted Answer

A)  one-fourth the brightness of Star B. 
B)  one-half the brightness of Star B. 
C)  the same brightness as Star B. 
D)  twice the brightness of Star B. 
E)  four times the brightness of Star B. 
A)  one-fourth the brightness of Star B. 
B)  one-half the brightness of Star B. 
C)  the same brightness as Star B. 
D)  twice the brightness of Star B. 
E)  four times the brightness of Star B.

Question 7

Lines from molecules are strongest in ___ type stars.

Accepted Answer

A)  A 
B)  F 
C)  M 
D)  K 
E)  O 
A)  A 
B)  F 
C)  M 
D)  K 
E)  O

Question 8

What distinguishes the spectral type of a star?

Accepted Answer

A)  its brightness 
B)  the lines in its spectrum 
C)  its distance 
D)  its velocity 
A)  its brightness 
B)  the lines in its spectrum 
C)  its distance 
D)  its velocity

Question 9

A star of apparent magnitude ____ appears 2.51 times brighter than a star of apparent magnitude 4.

Accepted Answer

A)  1 
B)  1.49 
C)  3 
D)  6.51 
E)  10 
A)  1 
B)  1.49 
C)  3 
D)  6.51 
E)  10

Question 10

How can we explain the fact that hydrogen Balmer lines are essentially absent in the hot O type and the cool M stars?

Accepted Answer

A)  O type stars do not contain hydrogen. 
B)  In cool stars hydrogen combines to form large molecules. 
C)  In O stars hydrogen is ionized and in M stars the electrons of hydrogen are in level 1, not level 2. 
D)  All of these choices are correct. 
A)  O type stars do not contain hydrogen. 
B)  In cool stars hydrogen combines to form large molecules. 
C)  In O stars hydrogen is ionized and in M stars the electrons of hydrogen are in level 1, not level 2. 
D)  All of these choices are correct.

Question 11

The star Aldebaran is a red giant, and is much more luminous than the Sun. What conclusions can be drawn from this fact?

Accepted Answer

A)  Aldebaran is hotter and much more massive than the Sun. 
B)  Aldebaran is cooler than the Sun, but has larger diameter than the Sun. 
C)  In the H-R diagram, Aldebaran is above and to the left of the Sun. 
D)  Aldebaran is a binary star. 
E)  None of these choices is correct. 
A)  Aldebaran is hotter and much more massive than the Sun. 
B)  Aldebaran is cooler than the Sun, but has larger diameter than the Sun. 
C)  In the H-R diagram, Aldebaran is above and to the left of the Sun. 
D)  Aldebaran is a binary star. 
E)  None of these choices is correct.

Question 12

Star A is located at the top left of the H-R diagram and has the same luminosity as Star B which is located at the top right of the H-R diagram. How must these stars differ?

Accepted Answer

A)  Star A is hotter and bigger than Star B. 
B)  Star A is cooler and bigger than Star B. 
C)  Star A is hotter and smaller than Star B. 
D)  Star A is cooler and smaller than Star B. 
A)  Star A is hotter and bigger than Star B. 
B)  Star A is cooler and bigger than Star B. 
C)  Star A is hotter and smaller than Star B. 
D)  Star A is cooler and smaller than Star B.

Question 13

Nearby stars have larger parallax angles, therefore their distance in parsecs is smaller.

Accepted Answer

A) True 
 B)False

Question 14

Parallax measurements of the distances to the nearest stars use _____ as a baseline.

Accepted Answer

A)  Earth's orbit 
B)  Earth's diameter 
C)  Earth-Moon distance 
D)  about the length of a football field 
A)  Earth's orbit 
B)  Earth's diameter 
C)  Earth-Moon distance 
D)  about the length of a football field

Question 15

A star radiates most strongly at 400 nm. What is its surface temperature?

Accepted Answer

A)  483 K 
B)  4,830 K 
C)  7,250 K 
D)  72,500 K 
A)  483 K 
B)  4,830 K 
C)  7,250 K 
D)  72,500 K

Question 16

Measuring stellar masses using binary stars is difficult because binary stars are rare.

Accepted Answer

A) True 
 B)False

Question 17

A star's parallax can reveal its distance. Stars with larger parallaxes are _______.

Accepted Answer

A)  farther away 
B)  closer 
C)  the same distance as other stars 
D)  This is a trick question. Parallax cannot be measured for stars! 
A)  farther away 
B)  closer 
C)  the same distance as other stars 
D)  This is a trick question. Parallax cannot be measured for stars!

Question 18

Star A and Star B have same temperatures, but Star A is more luminous than Star B. Based on this information, which of the following must be the case?

Accepted Answer

A)  Star A is smaller than Star B. 
B)  Star A is larger than Star B. 
C)  Star A and Star B have same size. 
D)  Star A is more massive than Star B. 
A)  Star A is smaller than Star B. 
B)  Star A is larger than Star B. 
C)  Star A and Star B have same size. 
D)  Star A is more massive than Star B.

Question 19

An M type star 1,000 times more luminous than the Sun will be located near the ___ part of the H-R diagram.

Accepted Answer

A)  top left 
B)  top right 
C)  center 
D)  bottom right 
E)  bottom left 
A)  top left 
B)  top right 
C)  center 
D)  bottom right 
E)  bottom left

Question 20

A 10th magnitude star is ____________ than a 5th magnitude star.

Accepted Answer

A)  2 times brighter 
B)  2 times fainter 
C)  100 times brighter 
D)  100 times fainter 
A)  2 times brighter 
B)  2 times fainter 
C)  100 times brighter 
D)  100 times fainter

The luminosity class of a star can be determined from the width of the spectral lines of the star.

Analysis of _ stars has shown that star masses are in the range of _ to ____ solar masses.

What is parallax?

A star radiates most strongly at 600 nanometers. What is its surface temperature?

In the above H-R diagram sketch, which star is a red giant?

If Star A is twice as far as Star B, and they are identical in all other ways, then the brightness of Star A would be

Lines from molecules are strongest in ___ type stars.

What distinguishes the spectral type of a star?

A star of apparent magnitude ____ appears 2.51 times brighter than a star of apparent magnitude 4.

How can we explain the fact that hydrogen Balmer lines are essentially absent in the hot O type and the cool M stars?

The star Aldebaran is a red giant, and is much more luminous than the Sun. What conclusions can be drawn from this fact?

Star A is located at the top left of the H-R diagram and has the same luminosity as Star B which is located at the top right of the H-R diagram. How must these stars differ?

Nearby stars have larger parallax angles, therefore their distance in parsecs is smaller.

Parallax measurements of the distances to the nearest stars use _____ as a baseline.

A star radiates most strongly at 400 nm. What is its surface temperature?

Measuring stellar masses using binary stars is difficult because binary stars are rare.

A star's parallax can reveal its distance. Stars with larger parallaxes are _______.

Star A and Star B have same temperatures, but Star A is more luminous than Star B. Based on this information, which of the following must be the case?

An M type star 1,000 times more luminous than the Sun will be located near the ___ part of the H-R diagram.

A 10^th magnitude star is ____________ than a 5^th magnitude star.

The Cycles of the Sky

The Rise of Astronomy

Gravity and Motion

Light and Atoms

Telescopes

Earth

The Moon

Survey of Solar Systems

The Terrestrial Planets

The Outer Planets

Small Bodies Orbiting the Sun

The Sun, Our Star

Stellar Evolution

Stellar Remnants: White Dwarfs, Neutron Stars, and Black Holes

The Milky Way Galaxy

Galaxies

Cosmology

Filters

Exam 13: Measuring the Properties of Stars

The luminosity class of a star can be determined from the width of the spectral lines of the star.

Analysis of ___ stars has shown that star masses are in the range of ___ to ____ solar masses.

What is parallax?

A star radiates most strongly at 600 nanometers. What is its surface temperature?

In the above H-R diagram sketch, which star is a red giant?

If Star A is twice as far as Star B, and they are identical in all other ways, then the brightness of Star A would be

Lines from molecules are strongest in ___ type stars.

What distinguishes the spectral type of a star?

A star of apparent magnitude ____ appears 2.51 times brighter than a star of apparent magnitude 4.

How can we explain the fact that hydrogen Balmer lines are essentially absent in the hot O type and the cool M stars?

The star Aldebaran is a red giant, and is much more luminous than the Sun. What conclusions can be drawn from this fact?

Star A is located at the top left of the H-R diagram and has the same luminosity as Star B which is located at the top right of the H-R diagram. How must these stars differ?

Nearby stars have larger parallax angles, therefore their distance in parsecs is smaller.

Parallax measurements of the distances to the nearest stars use _____ as a baseline.

A star radiates most strongly at 400 nm. What is its surface temperature?

Measuring stellar masses using binary stars is difficult because binary stars are rare.

A star's parallax can reveal its distance. Stars with larger parallaxes are _______.

Star A and Star B have same temperatures, but Star A is more luminous than Star B. Based on this information, which of the following must be the case?

An M type star 1,000 times more luminous than the Sun will be located near the ___ part of the H-R diagram.

A 10th magnitude star is ____________ than a 5th magnitude star.

The Cycles of the Sky

The Rise of Astronomy

Gravity and Motion

Light and Atoms

Telescopes

Earth

The Moon

Survey of Solar Systems

The Terrestrial Planets

The Outer Planets

Small Bodies Orbiting the Sun

The Sun, Our Star

Stellar Evolution

Stellar Remnants: White Dwarfs, Neutron Stars, and Black Holes

The Milky Way Galaxy

Galaxies

Cosmology

Filters

Analysis of _ stars has shown that star masses are in the range of _ to ____ solar masses.

A 10^th magnitude star is ____________ than a 5^th magnitude star.