amplitude - the maximum distance that the particles of a wave’s medium vibrate from their rest position, Doppler Effect - an observed change in the frequency of a wave when the source or observer is moving, Frequency - the number of cycles or vibrations per unit of time; also the number of waves produced in a given amount of time, Period - in physics, the time that it takes a complete cycle or wave oscillation to occur, wavelength - the distance from any point on a wave to an identical point on the next wave, crest - the highest point of a wave, electromagnetic wave - a wave that consists of oscillating electric and magnetic fields, which radiate outward at the speed of light, longitudinal wave - a wave in which the particles of the medium vibrate parallel to the direction of wave motion, mechanical wave - a wave that requires a medium through which to travel, medium - a physical environment in which phenomena occur, transverse wave - a wave in which the particles of the medium move perpendicularly to the direction the wave is traveling, trough - the lowest point of a wave,

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