The most striking example of solar variability was the
A) Dust Bowl drought of the 1930s.
B) Maunder Minimum from 1645-1715.
C) Sporer Minimum that doomed the Anasazi.
D) fall of Rome.
E) Joseph's seven lean years in the Old Testament.
B
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Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's luminosity and apparent brightness?
A) Luminosity is decreased by a factor of four and the apparent brightness is decreased by a factor of four. B) Luminosity is decreased by a factor of two and the apparent brightness is decreased by a factor of two. C) Luminosity remains the same, but the apparent brightness is decreased by a factor of two. D) Luminosity remains the same, but the apparent brightness is decreased by a factor of four. E) Luminosity is decreased by a factor of four, but the apparent brightness remains the same.
The formation process for supermassive black holes is linked with the formation of galactic ____
a. disks b. clusters c. central bulges d. coronae e. halos
Which of the following best describes the property of the period of orbital revolution for an Earth satellite?
a. greater when the orbital radius is smaller b. greater when the orbital radius is larger c. independent of the orbital radius d. determined mainly by the satellite's mass
After three half-lives, 3/4 of the nuclei in a sample of a radioisotope have decayed
a. True b. False Indicate whether the statement is true or false