,A large luminosity star
a) is always at a larger distance than a small luminosity star
b) emits more light than a low luminosity star
c) is always redder than a star with a small luminosity
d) is at a lower temperature than a small luminosity star
e) is always at a smaller distance than a small luminosity star - CORRECT ANSWERS-
emits more light than a low luminosity star
If a red giant appears the same brightness as a red main sequence star, which one is
further away?
a) the red giant
b) we can't tell
c) it depends on the phase of the Moon
d) the main sequence star
e) they are at the same distance - CORRECT ANSWERS-the red giant
The heaviest nuclei of all are formed
a) during helium burning
b) as part of the p-p chain
c) during carbon burning
d) during a supernova explosion
e) during all stages of stellar evolution of massive stars - CORRECT ANSWERS-during
a supernova explosion
Fill in the blank in the following chemical reaction that occurs in the Sun: Hydrogen-2 +
proton = ?? + energy:
a) Hydrogen-2
b) Hydrogen-1
c) Helium-3
d) Carbon-12
e) Helium-4 - CORRECT ANSWERS-Helium-3
Which of the following has the smallest radius?
a) type A main sequence star
b) main sequence star with surface temperature 8000K
c) type K main sequence star
d) white dwarf
e) neutron star - CORRECT ANSWERS-neutron star
Why does the main sequence part of a star's life end?
a) The Helium in the core is exhausted.
b) The gravitational force is no longer large enough to balance the
pressure.
c) The Hydrogen in the core is exhausted.
, d) The temperature drops so that nuclear reactions are no longer
possible.
e) Much of the mass of the star has evaporated. - CORRECT ANSWERS-The
Hydrogen in the core is exhausted.
Which of the following will have the shortest lifetime on the main sequence?
a) main sequence star with surface temperature 20000K
b) main sequence star with surface temperature 3000K
c) main sequence star with luminosity one tenth that of the Sun
d) the Sun
e) main sequence star with mass 2 times the Sun - CORRECT ANSWERS-main
sequence star with surface temperature 20000K
Many of the brightest 100 stars viewed from Earth are not on the main sequence (even
though most stars are) because:
a) only high mass stars formed near to us in the Galaxy.
b) the most luminous stars are giants and supergiants that have already
finished their main sequence lifetimes.
c) our region of the Galaxy is very young.
d) the main sequence is the shortest part of a star's life so stars don't
spend much time there.
e) our region of the Galaxy is very old. - CORRECT ANSWERS-the most luminous
stars are giants and supergiants that have already
finished their main sequence lifetimes.
A 2 solar mass main sequence star is at the same distance as a 0.2 solar mass main
sequence star. Which star appears brighter?
a) depends on the phase of the Moon
b) the 2 solar mass main sequence star appears brighter
c) the stars are approximately the same brightness
d) the 0.2 solar mass main sequence star appears brighter
e) we cannot tell with the information given - CORRECT ANSWERS-the 2 solar mass
main sequence star appears brighter
The temperature of the photosphere of the Sun is closest to
a) 107 Kelvin
b) 106 Kelvin
c) 100 Kelvin
d) 600,000 Kelvin
e) 6000 Kelvin - CORRECT ANSWERS-6000 Kelvin
An estimate of the number of communicating/technological civilizations that we expect
in our Galaxy would have a largernumberif
a) the average lifetime of communicating civilization was smaller
b)the star formation rate in our Galaxy was smaller
c) the average number of planets that could support life for each star was larger
a) is always at a larger distance than a small luminosity star
b) emits more light than a low luminosity star
c) is always redder than a star with a small luminosity
d) is at a lower temperature than a small luminosity star
e) is always at a smaller distance than a small luminosity star - CORRECT ANSWERS-
emits more light than a low luminosity star
If a red giant appears the same brightness as a red main sequence star, which one is
further away?
a) the red giant
b) we can't tell
c) it depends on the phase of the Moon
d) the main sequence star
e) they are at the same distance - CORRECT ANSWERS-the red giant
The heaviest nuclei of all are formed
a) during helium burning
b) as part of the p-p chain
c) during carbon burning
d) during a supernova explosion
e) during all stages of stellar evolution of massive stars - CORRECT ANSWERS-during
a supernova explosion
Fill in the blank in the following chemical reaction that occurs in the Sun: Hydrogen-2 +
proton = ?? + energy:
a) Hydrogen-2
b) Hydrogen-1
c) Helium-3
d) Carbon-12
e) Helium-4 - CORRECT ANSWERS-Helium-3
Which of the following has the smallest radius?
a) type A main sequence star
b) main sequence star with surface temperature 8000K
c) type K main sequence star
d) white dwarf
e) neutron star - CORRECT ANSWERS-neutron star
Why does the main sequence part of a star's life end?
a) The Helium in the core is exhausted.
b) The gravitational force is no longer large enough to balance the
pressure.
c) The Hydrogen in the core is exhausted.
, d) The temperature drops so that nuclear reactions are no longer
possible.
e) Much of the mass of the star has evaporated. - CORRECT ANSWERS-The
Hydrogen in the core is exhausted.
Which of the following will have the shortest lifetime on the main sequence?
a) main sequence star with surface temperature 20000K
b) main sequence star with surface temperature 3000K
c) main sequence star with luminosity one tenth that of the Sun
d) the Sun
e) main sequence star with mass 2 times the Sun - CORRECT ANSWERS-main
sequence star with surface temperature 20000K
Many of the brightest 100 stars viewed from Earth are not on the main sequence (even
though most stars are) because:
a) only high mass stars formed near to us in the Galaxy.
b) the most luminous stars are giants and supergiants that have already
finished their main sequence lifetimes.
c) our region of the Galaxy is very young.
d) the main sequence is the shortest part of a star's life so stars don't
spend much time there.
e) our region of the Galaxy is very old. - CORRECT ANSWERS-the most luminous
stars are giants and supergiants that have already
finished their main sequence lifetimes.
A 2 solar mass main sequence star is at the same distance as a 0.2 solar mass main
sequence star. Which star appears brighter?
a) depends on the phase of the Moon
b) the 2 solar mass main sequence star appears brighter
c) the stars are approximately the same brightness
d) the 0.2 solar mass main sequence star appears brighter
e) we cannot tell with the information given - CORRECT ANSWERS-the 2 solar mass
main sequence star appears brighter
The temperature of the photosphere of the Sun is closest to
a) 107 Kelvin
b) 106 Kelvin
c) 100 Kelvin
d) 600,000 Kelvin
e) 6000 Kelvin - CORRECT ANSWERS-6000 Kelvin
An estimate of the number of communicating/technological civilizations that we expect
in our Galaxy would have a largernumberif
a) the average lifetime of communicating civilization was smaller
b)the star formation rate in our Galaxy was smaller
c) the average number of planets that could support life for each star was larger
