If Earth's mass were suddenly and magically reduced to half its present value, the magnitude of Earth's acceleration about the Sun would
A. be reduced by a factor of 4.
B. be reduced by a factor of 2.
C. remain the same.
D. increase by a factor of 2.
Answer: C. remain the same.
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Emission lines are produced by ____
a. atoms that become ionized b. electrons that transfer from a high energy level to a low energy level c. electrons that transfer from a low energy level to a high energy level d. the intensity of agitation of atoms in a hot gas e. the motion of an object toward or away from the observer
Star A and star B both have an apparent magnitude of 4.0, but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct?
A) Star A appears brighter than star B, but actually star B and star A are the same brightness. B) Star B appears brighter than star A, but actually star B and star A are the same brightness. C) Star A and star B appear to have the same brightness, but actually star B is brighter than star A. D) Star A and star B appear to have the same brightness, but actually star A is brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
The distinguishing feature of a starburst galaxy is ________
A) strong radio emission from "lobes" of material well outside the visible boundaries of the galaxy B) a very large luminosity compared to the total luminosity of the Milky Way C) a rate of star formation that may be 100 or more times greater than that in the Milky Way D) the presence of an unusually large number of binary star systems containing X-ray bursters
If glass expanded more than mercury in a thermometer, then with rising temperature the column of mercury would
A) rise. B) not change. C) fall.