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The equation of a wave travelling on a s...

The equation of a wave travelling on a string is `y=8 sin [pi/2 (4t-x/16)]`, where x, y are in cm and t in second. The velocity of the wave is

A

64 `cms^-1` , in -x direction

B

32 `cms^-1` , in -x direction

C

32 `cms^-1` , in +x direction

D

64 `cms^-1` , in +x direction

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