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40 Cards in this Set

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  • Back
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
D) the decrease in mass due to the reactions
A star on the main sequence obtains its energy from
A) fission
B) fusion
C) electrical forces
D) magnetic forces
E) gravitation
B) fusion
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
E) temperature vs. luminosity
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
C) 12 parsecs
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
E) temperature
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
A) I
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
B) heat up as they fall
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
A) Closer than 10 parsecs
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
A) cooler
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
C) larger in size
Where would you expect the peak of this star's spectrum to be?
A) Blue
B) Yellow
C) Infrared
D) Answer cannot be determined
B) Yellow
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
B) on the main sequence
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.
B) take a shorter time to reach the main sequence
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
A) gravity
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
A) Only there is it hot enough and dense enough
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
D) its luminosity
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
A) Main Sequence star
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
B) the larger its luminosity
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
B) dimmer than
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
B) closer than star B
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
A) red, yellow, blue
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
B) B-type star
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
D) The temperature of the star
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.
B) B-type
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
D) Helium
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
E) the H-R diagram
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
C) They are bigger in size (diameter)
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
B) Star B
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
A) Star A
Which star is closer?
A) Star A
B) Star B
C) they are the same
D) the answer cannot be determined from the information
A) Star A
The Sun's energy is produced by
A) Chemical reactions
B) Fusion reactions
C) Gravitational compression
D) Fission reactions
E) none of the above
B) Fusion reactions
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
E) there is not enough information to determine the answer
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.
D) K-type
Cepheid variables are important as
A) distance indicators
B) speed indicators
C) mass indicators
D) size indicators
A) distance indicators
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
C) a larger luminosity
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
B) Star B
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
A) Star A
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.
B) Star B
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
B) Star B
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
A) Star A, away from us