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Wavelength and amplitude

Definition 1: Wavelength

The wavelength in a longitudinal wave is the distance between two consecutive points that are in phase.

The wavelength in a longitudinal wave refers to the distance between two consecutive compressions or between two consecutive rarefactions.

Definition 2: Amplitude

The amplitude is the maximum displacement from equilibrium. For a longitudinal wave which is a pressure wave this would be the maximum increase (or decrease) in pressure from the equilibrium pressure that is cause when a compression (or rarefaction) passes a point.

Figure 1: Wavelength of a longitudinal wave
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The amplitude is the distance from the equilibrium position of the medium to a compression or a rarefaction.