red giant stars must be large compared to hot main sequence stars because they are
A brighter
B farther away
C fainter per square foot of surface
D older
on the main sequence, hot stars are generally _______ than cool ones.
A more massive and longer lived.
B less massive and longer lived.
C more massive and shorter lived.
D less massive and shorter lived.
E more massive, but nothing can be said about the lengths of their lifetimes.
in its red-giant stage, a star is
A hotter and less luminous than it was on the main sequence
B cooler and less luminous than it was on the main sequence
C cooler and larger than it was on the main sequence
D hotter and larger than it was on the main sequence
population I stars have ______ amount of heavy elements in comparison to population II stars.
A a greater
B a lower
C the same
where are the smallest stars found on an HR diagram?
A at the upper left end of the main sequence.
B at the lower right end of the main sequence.
C at the upper right corner of the HR diagram.
D at the lower left corer of the HR diagram.
main sequence stars are the most common type of star because
A stars spend most of their lives there
B stars become trapped there
C stars naturally evolve toward that type as they age
D most stars occur in star clusters
on an H-R diagram, most stars lie in a region called the
A red giant branch
B main sequence region
C white dwarf sequence
D none of the above
which of the following stars is faintest
A the sun
B hot main sequence star
C white dwarf
D red giant
we know that red giant stars a large because
A they are so bright
B all of them are old
C they are very bright even though cool stars emit less energy from each square foot of surface
D they orbit around such hot stars
compared to other stars, the sun is
A about average in all respects
B among the smallest stars
C among the hottest stars
D one of the oldest stars
which of the following stars has the smallest actual brightness
A red giant
B blue main sequence star
C sun
D white dwarf
most stars are
A main sequence stars
B red giants
C white dwarfs
D neutron stars
red giant stars are larger than most stars because
A all stars must be large to be bright
B cool stars must be large to be bright
C massive stars must be large
D bright stars must be cool
the less the mass of a main sequence star, the
A less light it emits as a whole
B greater its surface temperature
C bluer it is
D less carbon it produces by means of fusion
which of the following star types are most numerous in a large sampling of stars?
A white dwarfs
B red giants
C black holes
D main-sequence
at what stage of its evolutionary life is the sun?
A post main sequence, red giant (cool) phase
B pre main sequence, variable star
C just before supernova stage, late evolutionary
D main sequence
measurements indicate that a certain star has a very high actual brightness (100,000 times that of our sun) and yet has a temperature that is quite cool (3500 Kelvins).how can this be?
A it must be a main sequence star
B it must be quite large
C it must be an error in observation
D there is no problem, 90 percent of all stars are like this
a yellow main sequence star is part of a visual binary star with a hotter but dimmer companion
A the dimmer star must be smaller
B the yellow star may be a red giant
C the dimmer star may be a red giant
D the yellow one must be more massive
which of the following stars has the largest actual brightness
A sun
B white dwarf
C red giant
D red main sequence star
red giant stars are in what part of the H-R diagram?
A high luminosity, high temperature
B high luminosity, low temperature
C low luminosity, low temperature
D low luminosity, high temperature
bright stars with low temperatures
A have small diameters compared with the sun
B have diameters comparable with that of the sun
C have large diameters compared with that of the sun
D are white dwarfs
the smallest stars normally plotted in an H-R diagram are
A main sequence stars
B white dwarfs
C red giants
D neutron stars
which of the following stars has the coolest surface temperature
A a massive main sequence star
B a red giant
C the sun
D a white dwarf
stars on the main sequence that have a small mass are
A bright and hot.
B dim and hot.
C dim and cool.
D bright and hot.
E any of the above; there is no regular relationship.
considering only stars on the main sequence, the most massive stars are the
A hottest and brightest.
B hottest and dimmest.
C coolest and brightest.
D coolest and dimmest.
E no general statement can be made.
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