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Reflection of Sound Waves

Assertion - O...

Question

Assertion - On reflection from a rigid boundary there takes place a complete reversal of phase.
Reason - On reflection from a denser medium, both the particle velocity and wave velocity are reversed in sign.

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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C

Assertion is correct but Reason is incorrect

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D

Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The reflection from a rigid boundary is same as the reflection from a medium of high density or a denser medium. When the reflection takes place, there is a reversal in the sign of the wave velocity as well as the particle velocity i.e. the complete reversal of the phase.

Thus, option $A$ is correct.

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