MHT CET Physics question

When sound is reflected from a denser medium, [MH-CET 2007]

(A)Crest is reflected as a trough
(B)Crest is reflected as a crest
(C)Compression is reflected as a rarefaction
(D)Compression is reflected as a compressionCorrect

Answer: (D)

Solution

Sound is a longitudinal wave, and at a denser (rigid) medium a compression is reflected as a compression and a rarefaction as a rarefaction (the displacement changes phase by , the pressure

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Question ID VK-070150