transverse, The particles oscillate perpendicular to the direction of energy transfer., longitudinal, The particles oscillate parallel with the direction of energy transfer., amplitude, The maximum height of the wave from rest position to the top of a crest., wavelength, The distance from the top of a crest to the top of the next crest., frequency, The number of waves in one second., period, The time for one complete wave., compression, An area of high pressure in a longitudinal wave., rarefaction, An area of low pressure in a longitudinal wave..

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