Astronomers no longer build large observatories in populated areas in order to avoid _______________
Fill in the blank(s) with correct word
light pollution
radio interference
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Suppose that a source of sound is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be
A) unchanged. B) half as great. C) as great. D) twice as great. E) one-fourth as great.
An emission spectrum can be used to identify a(n):
A) proton. B) electron. C) neutron. D) atom. E) neutrino.
Which quantity can be converted from the English system to the metric system by the conversion factor 
?
A. feet per second B. feet per hour C. miles per second D. miles per hour E. miles per minute
The orbital resonances with Jupiter are shown in the:
A) Cassini division. B) Zone of Avoidance. C) Kirkwood Gaps. D) ring arcs. E) orbits of the aten asteroids.