Comprehensive test bank for the Astronomy 1010 Final

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Comprehensive test bank for the Astronomy 1010 Final Exam, featuring accurate and up-to-date questions with verified answers covering key concepts in planetary science, stellar evolution, and cosmology.

From center outward, which of the following lists the "layers" of the Sun in the correct order?

• core, radiation zone, convection zone, corona, chromosphere,

photosphere

• core, convection zone, radiation zone, corona, chromosphere,

photosphere

• core, corona, radiation zone, convection zone, photosphere,

chromosphere

• core, radiation zone, convection zone, photosphere,

chromosphere, corona - ANSWER-D) core, radiation zone, convection zone, photosphere, chromosphere, corona

Since all stars begin their lives with the same basic composition, what characteristic is most important in determining how they will differ?

• their initial mass
• the time at which they formed 1 / 4

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• their initial color
• their initial luminosity
• their location in the galaxy - ANSWER-A) their initial mass

A star's luminosity is the

• total amount of energy that the star will radiate over its entire

lifetime.

• lifetime of the star.
• apparent brightness of the star in our sky.
• total amount of energy that the star radiates each second.
• surface temperature of the star. - ANSWER-D) total amount

of energy that the star radiates each second

Star A and B have the same luminosity, but star B is 10 times farther from Earth than star A. How much brighter will star A appear?

• 1,000 times
• 100 times
• 100,000 times
• 10 times
• 10,000 times - ANSWER-B) 100 times 2 / 4

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You measure the parallax angle for a star to be 0.1 arcseconds.The distance to this star is

• 10 parsecs.
• 0.1 parsec.
• 10 light-years.
• 0.1 light-year.
• impossible to determine. - ANSWER-A) 10 parsecs

Which of the following statements about apparent and absolute magnitudes is false ?

• A star's absolute magnitude is the apparent magnitude it

would have if it were at a distance of 10 parsecs from Earth.

• The apparent magnitude of a star is dependent upon its

luminosity.

• A star with an apparent magnitude of 1 appears brighter than

a star with an apparent magnitude of 2.

• The magnitude system that we use now is based on a system

used by the ancient Greeks over 2,000 3 / 4

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years ago that classified stars by how bright they appeared. - ANSWER-B) the apparent magnitude of a star is dependent upon its luminosity

The spectral sequence sorts stars according to

• mass.
• luminosity.
• surface temperature.
• radius.
• core temperature - ANSWER-C) surface temperature

On a Hertzsprung-Russell diagram, where on the main sequence would you find stars that have the greatest mass?

• upper right
• lower right
• upper left
• lower left - ANSWER-C) upper left

On the main sequence, stars obtain their energy

• from nuclear fission.
• from gravitational contraction.
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