7232762
Questão 1
Questão
What is the spectral sequence in order of increasing temperature?
Responda
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MKFAGBO
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BAFGKMO
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MKGFABO
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ABFMKGO
Questão 2
Questão
Which of the following can we use to determine the surface temperature of a star?
Responda
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determining if the star has a companion star
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studying its line absorption spectrum
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measuring the star’s distance
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measuring the star’s parallax
Questão 3
Questão
The table lists the spectral types for each of four stars. Which star in this table would have the lowest surface temperature?
Responda
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α For
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ο Cet
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γ Tri
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ξ Per
Questão 4
Questão
The table lists the spectral types for each of four stars. Which star in this table would have the highest surface temperature?
Responda
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α For
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a
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γ Tri
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ξ Per
Questão 5
Questão
What properties of a star determine its luminosity?
Responda
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distance and diameter
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temperature and distance
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temperature and diameter
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apparent magnitude and temperature
Questão 6
Questão
How do we know that giant stars are larger in diameter than the Sun?
Responda
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They are more luminous but have about the same temperature
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They are less luminous but have about the same temperature
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They are hotter but have about the same luminosity
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They are cooler but have about the same luminosity
Questão 7
Questão
Sirius A and B are two stars at the same distance from the Earth. In this binary system, Sirius A is much brighter but Sirius B is much hotter. From this information, what can you conclude about the two stars?
Responda
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Sirius B must be much smaller than Sirius A
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Sirius B must be much larger than Sirius A
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Sirius B must be much more massive than Sirius A
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Sirius B must be much less massive than Sirius A
Questão 8
Questão
In a Hertzsprung-Russell diagram, where are the stars with the smallest radius found?
Responda
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in the upper left corner
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in the upper right corner
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in the lower left corner
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in the lower right corner
Questão 9
Questão
In a Hertzsprung-Russell diagram, where are 90 percent of all the stars found?
Responda
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in the giant region
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in the supergiant region
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on the dwarf sequence
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on the main sequence
Questão 10
Questão
The star named Sheat is of spectral type M2 and luminosity class II. Based on this information, how does Sheat compare to the Sun?
Responda
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Sheat is cooler and larger than the Sun
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Sheat is cooler and smaller than the Sun
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Sheat is hotter and more luminous than the Sun
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Sheat is hotter and larger than the Sun
Questão 11
Questão
The star named Circini has the spectral type and luminosity class of O 8.5 V. Based on this information, how does Circini compare to the Sun?
Responda
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Circini is cooler and larger than the Sun
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Circini is cooler and smaller than the Sun
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Circini is hotter and more luminous than the Sun
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Circini is hotter and less luminous than the Sun
Questão 12
Questão
Where are red giant stars found in the Hertzsprung-Russell diagram?
Responda
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above the main sequence
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below the main sequence
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on the lower main sequence
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on the upper main sequence
Questão 13
Questão
Which star in the table is the closest to Earth?
Responda
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δ Cen
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HR 4758
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HD 39801
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9 CMa
Questão 14
Questão
Which star in the table has the highest surface temperature?
Responda
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δ Cen
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HR 4758
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HD 39801
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9 CMa
Questão 15
Questão
Which star in the table has the largest diameter?
Responda
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δ Cen
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HR 4758
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HD 39801
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9 CMa
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