Vibration, A back and forth motion of an object, Vacuum, An area that contains no particles, Oscilloscope, A machine that represents sound waves as an electrical signal, Echo, Reflection of sound waves off of a surface, Absorption, When sound energy is transferred to the material, Wavelength, The distance from the point of one wave to the same point of the next wave, Frequency, The number of waves passing a point in one second, Amplitude, The height of a wave from the centre line to the highest (peak) or lowest (trough) point, Longitudinal Wave, A wave in which the oscillation of the particles is in the same direction as the energy transfer. Sound waves are longitudinal, Compression, Areas of particles that are close together, Rarefaction, Areas of particles that have moved apart.

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