Sounds from musical instruments are produced by
A) vibrating strings.
B) vibrating air columns.
C) percussion.
D) all of the above
E) none of the above
Answer: D
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The majority of Earth's atmosphere is found within which atmospheric layer?
A. stratosphere B. van Allen Belts C. troposphere D. ionosphere E. ozone layer
Which of these objects can be found in the spiral arms of the Galaxy?
A. Pop I stars B. Associations C. HII regions D. dying, red stars E. All of these choices are correct.
________ has a rotation period of 59 days, 2/3 as long as its 88 day year
Fill in the blank(s) with correct word
Which of the following is an example of a true "wave", as that word is used in physics?
A) A water wave that is coming into the beach, like the waves that surfers use to surfboard on B) A stream flowing downhill over rocks C) Both of the above. D) None of the above.