Lesson: Chapter 4 — Waves and their applications

4.3. Sound and how it travels 2 of 5 Reset answers

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Question 2

In a sound wave in air, what is a compression?

A A region where the air particles are crowded together and the pressure is higher B The highest point of the wave C A region where the air particles are spread out D A region with no air

The right answer is the one marked above.

A region where the air particles are crowded together and the pressure is higher. More particles in the same space means the pressure rises for a moment there.

Spread-out particles make a rarefaction, and a crest belongs to a transverse wave, not to sound.

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