energy - the ability to do work, wave - a disturbance involving the transfer of energy from place to place. , compression - a longitudinal wave where the particles of the medium are close together. , crest - the highst part of a transverse wave., electromagnetic - waves that can travel with or without a medium., amplitude - the maximum distance the medium vibrates from the rest position., wavelength - from one highest point of a wave to the next highest point of the wave. , mechanical - waves that require a medium to travel., reflection - the bouncing back of a wave when it hits a surface through which it can not pass. , transverse - a wave that vibrates the medium at right angles to the direction in which the wave travels., constructive - a type of interference that occurs when 2 waves combine to make a wave with an amplitude larger than the amplitude of either of the individual waves. , node - a point of zero amplitude on a standing wave. , trough - lowest part of a transverse wave, longitudinal - Wave that vibrates the medium in the same direction in which the wave travels. , frequency - the number of waves that pass a given point in a certain amount of time. , refraction - the bending of waves as they enter a new medium at an angle, caused by a change in speed. , medium - the material through which a wave travels., rarefaction - the part of a longitudinal wave where the particles of the medium are far apart. , diffraction - the bending or spreading of waves as they move around a barrier or pass through an opening. , destructive - a type of interference that occurs when 2 waves combine to make a wave with an aplitude smaller than the amplitude of either of the individual waves. , antinode - a point of maximum amplitude on a standing wave., resonance - the increase in the amplitude of a vibration that occurs when external vibrations match an objects natural frequency. , hertz (Hz) - a unit of measurement for frequency, standing - a type of wave that appears to stand in one place, even though it is 2 waves interfering as they pass through each other. , vibration - a repeated back and forth or up and down motion. , interference - the interaction between waves that meet. ,

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