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In a longitudinal wave, what is the region where the particles are closest together called?

AA compression
BA rarefaction
CA wave crest
DA wave trough
Answer & Solution
Correct answer: A. A compression
1. A longitudinal wave squeezes and stretches the medium along the direction it travels. 2. The squeezed region, where the particles are closest together, is a compression. 3. The stretched region, where the particles are furthest apart, is a rarefaction. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 9: Longitudinal waves_
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