The equation of a wave travelling on a string is $y = 4\sin \frac{\pi }{2}\left( {8t - \frac{x}{8}} \right)$. If $x$ and $y$ are in $cm,$ then velocity of wave is
  • A$64\, cm/sec$ in $-x$ direction
  • B$32\,cm/sec$ in $-x$ direction
  • C$32\, cm/sec$ in $+ x$ direction
  • D$64\, cm/sec$ in $+ x$ direction
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