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The sound wave reflected from denser med...

The sound wave reflected from denser medium.
A) Particle velocity changes . B) Wave velocity changes . C) Compressionis reflected as rarefraction. D) Change of phase of `180^@` between incident and reflected waves .
Which of the above statements are correct ?

A

all of the above

B

A,B and D only

C

B and D only

D

B,C and D

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