Wave, disturbance that transfers energy from one place to another without transferring matter., Transverse wave, wave in which the disturbance is perpendicular to the direction the wave travels, Trough, the lowest point of the wave., Crest, the highest point of the wave., longitudinal wave, longitudinal wave causes the particles in a medium to move parallel to the direction that the wave travels, Compression, where the particles are close together., Rarefaction, where the particles are spread apart., Wavelength, The distance between one point and another., Amplitude, The distance from the center line to the top of a crest or to the bottom of a trough., Frequency, The number of waves that pass a fixed point in unit time., Wave speed, The distance traveled by a given point on the wave (such as a crest) in each interval of time.

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