SAT Subject Physics Practice Question 587: Answer and Explanation

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Question: 587

13. Sound waves cannot travel in

A. air.
B. metal.
C. vacuum.
D. water.
E. wood.

Correct Answer: C


The correct answer is (C). Sound waves are compressional waves; thus they need a medium through which they can move. A vacuum does not provide a way for the compressions to move along.

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