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A wave has equation as y=0.5 sin(2pi/3 (...

A wave has equation as `y=0.5 sin(2pi/3 (400t-x))` with x in meters and t in seconds the wave speed is equal to

A

`100 m/s`

B

`100 pi m/s`

C

`400 m/s`

D

`200 pi m/s`

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