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In a plane progressive harmonic wave, particle speed is always less than the wave speed, if
  • Aamplitude of wave is less than $\frac{\lambda }{{2\pi }}$
  • Bamplitude of wave is greater than $\frac{\lambda }{{2\pi }}$
  • Camplitude of wave is less than $\lambda $
  • Damplitude of wave is greater than $\frac{\lambda }{\pi }$
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