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A standing wave pattern of amplitude $A$ in a string of length $L$ shows $2$ nodes (plus those at two ends). If one end of the string corresponds to the origin and $v$ is the speed of progressive wave, the disturbance in the string, could be represented (with appropriate phase) as: 
  • A$y(x,t) = A\sin \left( {\frac{{2\pi x}}{L}} \right)\cos \left( {\frac{{2\pi vt}}{L}} \right)$
  • B$y(x,t) = A\cos \left( {\frac{{3\pi x}}{L}} \right)\sin \left( {\frac{{3\pi vt}}{L}} \right)$
  • C$y(x,t) = A\cos \left( {\frac{{4\pi x}}{L}} \right)\cos \left( {\frac{{4\pi vt}}{L}} \right)$
  • D$y(x,t) = A\sin \left( {\frac{{3\pi x}}{L}} \right)\cos \left( {\frac{{3\pi vt}}{L}} \right)$
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