longitudinal waves - the vibrations are parallel to the direction of wave travel., transverse waves - the vibrations are at right angles to the direction of wave travel., amplitude - is the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough., wavelength - is the distance from any point on one wave to the same point on the next wave along., crest - the highest point of a wave, trough - the lowest point of a wave, frequency - is the number of waves passing a point in a certain time., hertz - the unit of frenquency.,

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