Longitudinal Wave

On a longitudinal wave:

  • A compression is a region where particles are close to one another. (High pressure)
  • A rarefaction is a region where the particles are further apart. (Low pressure)

For a longitudinal wave at an instant of time,

  • displacement is zero when the particle is at equilibrium position
  • displacement is positive when the particle is displaced to the right of its equilibrium position
  • displacement is negative when the particle is displaced to the left of its equilibrium position

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