Astronomy Final Part 2

Front 1

The energy produced in nuclear reactions in the Sun results from
A) friction as the nuclei crash together
B) heat produced from the electrical effects of the reactions
C) the increase in mass due to the reactions
D) the decrease in mass due to the reactions

Back 1

D) the decrease in mass due to the reactions

Front 2

A star on the main sequence obtains its energy from
A) fission
B) fusion
C) electrical forces
D) magnetic forces
E) gravitation

Back 2

B) fusion

Front 3

An H-R diagram plots
A) temperature vs. space velocity
B) distance vs. temperature
C) stellar mass vs. distance
D) distance vs. space velocity
E) temperature vs. luminosity

Back 3

E) temperature vs. luminosity

Front 4

The star Fry has an apparent magnitude of 3 and an absolute magnitude of 2.5, which of the following would be the best guess for the distance to Fry?
A) 2 parsecs
B) 8 parsecs
C) 12 parsecs
D) 50 parsecs
E) The answer cannot be determined

Back 4

C) 12 parsecs

Front 5

The OBAFGKM classification of a star is determined by the star's
A) distance
B) space velocity
C) parallax angle
D) luminosity class
E) temperature

Back 5

E) temperature

Front 6

For a spectral type K star, which luminosity class is brighter (more luminous)?
A) I
B) II
C) III
D) IV
E) All spectral type K stars have the same luminosity

Back 6

A) I

Front 7

As a star is forming by the collapse of gases, the gases
A) cool as they fall
B) heat up as they fall
C) stay the same temperature
D) move slower

Back 7

B) heat up as they fall

Front 8

How far away is Hermes?
A) Closer than 10 parsecs
B) It is 10 parsecs from us
C) Further than 10 parsecs
D) Answer cannot be determined

Back 8

A) Closer than 10 parsecs

Front 9

Compared to the temperature of our Sun, a G star, Hermes is
A) cooler
B) the same temperature
C) hotter
D) answer cannot be determined

Back 9

A) cooler

Front 10

Compared to the diameter of our Sun, Hermes is
A) smaller in size
B) approximately the same size
C) larger in size
D) answer cannot be determined

Back 10

C) larger in size

Front 11

Where would you expect the peak of this star's spectrum to be?
A) Blue
B) Yellow
C) Infrared
D) Answer cannot be determined

Back 11

B) Yellow

Front 12

On the H-R diagram, a star spends most of its lifetime
A) getting to the main sequence
B) on the main sequence
C) as a variable
D) as a red giant

Back 12

B) on the main sequence

Front 13

More massive protostars _______ than less massive protostars.
A) take longer to reach the main sequence
B) take a shorter time to reach the main sequence
C) No general statement can be made relating mass to the length of time to reach the main sequence.

Back 13

B) take a shorter time to reach the main sequence

Front 14

The source of energy that makes a protostar warm (or hot) is
A) gravity
B) chemical energy
C) nuclear fission
D) nuclear fusion
E) fossil fuel

Back 14

A) gravity

Front 15

Why does "hydrogen burning" occur only in a main sequence star's center?
A) Only there is it hot enough and dense enough
B) Only there is there enough hydrogen that is not mixed with other elements
C) Only there is the speed of light favorable for the reaction to occur
D) Heat is transferred down to the center of a star during its main sequence life

Back 15

A) Only there is it hot enough and dense enough

Front 16

If we know how bright a star appears and we know its distance, then we also know
A) its temperature
B) its velocity
C) its composition
D) its luminosity
E) none of the above can be determined

Back 16

D) its luminosity

Front 17

Star A's spectrum shows broad (wide) absorption lines, we can infer Star A is a
A) Main Sequence star
B) Supergiant star
C) Giant molecular Cloud
D) none of the above, line width does not give information about a star's size

Back 17

A) Main Sequence star

Front 18

The longer the period of a Cepheid Variable,
A) the smaller its luminosity
B) the larger its luminosity
C) the further the star is from Earth
D) the closer the star is from Earth
E) there is no general statement to be made

Back 18

B) the larger its luminosity

Front 19

On the Main Sequence, M-type stars are _______ B-type stars
A) brighter than
B) dimmer than
C) the same brightness as
D) The answer cannot be determined

Back 19

B) dimmer than

Front 20

If star A has a parallax angle larger than star B, then star A must be
A) further than star B
B) closer than star B
C) brighter than star B
D) dimmer than star B
E) none of the above

Back 20

B) closer than star B

Front 21

After viewing several stars of differing colors, which list shows the colors of stars from coolest to hottest?
A) red, yellow, blue
B) yellow, blue, red
C) blue, yellow, red
D) red, blue, yellow
E) blue, red, yellow

Back 21

A) red, yellow, blue

Front 22

Assuming that each of the following stars is on the main sequence, which has the largest absolute luminosity?
A) A-type star
B) B-type star
C) G-type star
D) F-type star
E) The answer cannot be determined from the information given

Back 22

B) B-type star

Front 23

The wavelength where the peak of a star's spectrum is located tells us
A) The composition of the star
B) The spin period of the star
C) The distance to the star
D) The temperature of the star
E) none of the above

Back 23

D) The temperature of the star

Front 24

Which of the following stars is the hottest?
A) A-type
B) B-type
C) F-type
D) K-type
E) The answer cannot be determined from the information given.

Back 24

B) B-type

Front 25

After the hydrogen in the Sun's core is depleted, the core will consist primarily of
A) Carbon
B) Deuterium
C) Oxygen
D) Helium
E) Hydrogen

Back 25

D) Helium

Front 26

The method of spectroscopic parallax uses as one of its tools
A) stellar parallax
B) measurements of radial velocity
C) calculations of space velocity
D) calculations of stellar masses
E) the H-R diagram

Back 26

E) the H-R diagram

Front 27

Why is a spectral type M supergiant more luminous than a spectral type M main sequence star?
A) They are hotter
B) They are closer to us
C) They are bigger in size (diameter)
D) none of the above because the main sequence star is more luminous

Back 27

C) They are bigger in size (diameter)

Front 28

Which of the stars has a greater luminosity?
A) Star A
B) Star B
C) they are the same
D) the answer cannot be determined from the information

Back 28

B) Star B

Front 29

Which of the stars above is hotter?
A) Star A
B) Star B
C) they are the same
D) the answer cannot be determined from the information

Back 29

A) Star A

Front 30

Which star is closer?
A) Star A
B) Star B
C) they are the same
D) the answer cannot be determined from the information

Back 30

A) Star A

Front 31

The Sun's energy is produced by
A) Chemical reactions
B) Fusion reactions
C) Gravitational compression
D) Fission reactions
E) none of the above

Back 31

B) Fusion reactions

Front 32

Star A has an absolute magnitude of 1 and Star B has an absolute magnitude of 3. Star A is
A) closer than star B
B) further than star B
C) more red than star B
D) more blue than star B
E) there is not enough information to determine the answer

Back 32

E) there is not enough information to determine the answer

Front 33

From what you know about the H-R diagram and the luminosity-mass relationship, which of the following Main sequence type stars is the least massive?
A) A-type
B) B-type
C) G-type
D) K-type
E) The answer cannot be determined from the information given.

Back 33

D) K-type

Front 34

Cepheid variables are important as
A) distance indicators
B) speed indicators
C) mass indicators
D) size indicators

Back 34

A) distance indicators

Front 35

For two stars of the same apparent brightness (they look the same) but at different distances, the star further from us must have _______ compared to the closer star.
A) a higher temperature
B) a lower temperature
C) a larger luminosity
D) a smaller luminosity

Back 35

C) a larger luminosity

Front 36

Which star, A or B, is at a lower temperature?
A) Star A
B) Star B
C) they are at the same temperature
D) we are unable to determine that information

Back 36

B) Star B

Front 37

Which star is larger in size (diameter)?
A) Star A
B) Star B
C) they are the same size
D) we are unable to determine that information

Back 37

A) Star A

Front 38

Which star has the smallest luminosity?
A) Star A
B) Star B
C) they give off the same amount of energy
D) we are unable to determine that information.

Back 38

B) Star B

Front 39

Which star is closer?
A) Star A
B) Star B
C) they give off the same amount of energy
D) we are unable to determine that information

Back 39

B) Star B

Front 40

Which star do we know is moving and how is it moving?
A) Star A, away from us
B) Star A, toward us
C) Star B, away from us
D) Star B. toward us
E) we are unable to determine that information

Back 40

A) Star A, away from us