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When a compression in a sound wave is reflected at the boundary of a rarer medium, it returns as a
Acompression
Brarefaction
Ctransverse pulse
Dstanding wave
Answer & Solution
Correct answer: B. rarefaction
1. At a rarer medium the surface offers little resistance and is pushed back.
2. The free particles produce a rarefaction at the interface.
3. So a compression is reflected as a rarefaction.
4. At a denser (rigid) boundary, a compression returns as a compression instead.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.70_
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