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

The equetion of a wave travelling on a string is
`y = 4 sin(pi)/(2)(8t-(x)/(8))`
if x and y are in centimetres, then velocity of waves is

A

64 cm/s in -x direction.

B

32 cm/s in -x direction.

C

32 cm/s in +x direction.

D

64 cm/s in +x direction.

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The correct Answer is:
D
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