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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