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Define the following terms:
(i) Crest   
(II)Trough
(iii) Compression
(iv) Rare faction.

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Ans. Crest
The crest is the highest point of the particles of the medium from the mean position.

Trough
A trough is the lowest point of the particles of the medium from the mean position.

Compression
The region where the particles of the medium are closed together is known as compression.

Rarefaction
The region where the particles of the medium are spaced apart is known as rarefaction.

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