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MPSC State Service 2020 · GS · Question 51 of 97

When a compression of sound waves is incident on rigid wall, it is reflected as:

Physics

  1. ACompression with a phase change of π (by 180°)
  2. BCompression with no phase changeCorrect
  3. CRarefaction with a phase change of π 2 (by 90°)
  4. DRarefaction with no phase change

Answer: B. Compression with no phase change

Explanation

A compression reflected from a rigid wall returns as a compression with no phase change.

Source: MPSC Rajyaseva Prelims 2020 – GS Paper I (Set D), official paper

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