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Reflection from an Open End

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Question

What happens when a sound wave is reflected from the boundary of a denser medium? The compression of the incident wave is returned as a

A

rarefaction

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B

crest

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C

trough

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D

compression

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Solution

The correct option is B compression
Sound wave goes through $π$ phase change when reflected from the boundary of a denser medium. Hence, the compression of the incident wave is returned as a compression.

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