Longitudinal waves are those in which the displacement of the medium moves in the same plane as the wave's direction of travel.
- Rarefaction in a longitudinal wave is an area where the particles are spread apart, as opposed to compression in a longitudinal wave, when the particles are closest together.
- The wavelength is the measurement of the separation between the centers of two zones of compression or rarefaction that follow one another. Constructive interference occurs when the compression and rarefaction areas of two waves line up; destructive interference occurs when they don't.
- In a solid, liquid, or gaseous medium, this wave can be generated.
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