MHT CET Physics question

When longitudinal waves are reflected from the surface of a rarer medium, [MH-CET 2009]

(A)Compression is reflected as rarefaction without phase changeCorrect
(B)Compression is reflected as rarefaction with a phase change of rad
(C)Rarefaction is reflected as rarefaction without phase change
(D)Rarefaction is reflected as rarefaction with a phase change of rad

Answer: (A)

Solution

At a rarer medium (free end) the particles are free to move, so the reflected wave has no change of phase (in displacement) and a compression returns as a rarefaction;

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Question ID VK-070149