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For a sine wave passing through a medium...

For a sine wave passing through a medium, let y be the displacement of a particle, v be its velocity and a be its acceleration :-

A

`y,v` and `a` are always in the same phase.

B

`y` and `a` are always in opposite phase.

C

Phase different between `y` and `v` is `pi//2`.

D

Phase different between `v` and `a` is `pi//2`

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B, C, D
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