Waves, They involve the transport of energy without the transport of matter., Amplitude, The distance from the centre line to the top of a crest, Longitudinal, The vibrations are parallel to the direction of wave travel, Reflection, The return of sound from a surface, Trough, The bottom point of the wave, Vacuum, Space in which there is no matter, Pitch, Highness or lowness of sound, Decibel, The unit of measurement for sound, Vibration, The periodic motion of particles , Frequency, The number of waves that pass a fixed point in a given amount of time, Transverse, Waves which are perpendicular to the wave motion, Echo, Sound caused by the reflection of sound waves, Wavelength, The distance between two successive crests of a wave, Crest, The top point of a wave.

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