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Equation of the progressive wave is give...

Equation of the progressive wave is given by : `y=a sin pi (40 t-x)` where a and x are in metre and t in second. The velocity of the wave is

A

` 80 m//s`

B

` 10 m//s`

C

` 40 //s`

D

` 20//s`

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The correct Answer is:
C
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