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The equation of a progressive wave is g...

The equation of a progressive wave is given by `y = 0.5 sin (20 x - 400 t)` where xand y are in metre and tis in second. The velocity of the wave is

A

`10m//s`

B

`20 m//s`

C

`200 m//s`

D

`400 m//s`

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The correct Answer is:
B
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