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the parts of a longitudinal wave where particles are close together is …

Question

the parts of a longitudinal wave where particles are close together is called:
rare faction
trough
crest
compression

Explanation:

Brief Explanations

In a longitudinal wave, compression is the region where particles are close together. Rare - faction is where particles are spread out. Trough and crest are parts of a transverse wave, not a longitudinal wave.

Answer:

Compression