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A wave equation is y=0.01 sin (100 pi t-...

A wave equation is y=0.01 sin `(100 pi t- kx)` of wave velocity is 100 m/s, its number is equal to

A

`1m^-1`

B

`2m^-1`

C

`pim^-1`

D

`2pim^-1`

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