Echo, reflection of sound waves, Refraction, Bending of sound waves, Vibration, The creation of sound waves, Medium, A physical environment in which an event occur, Wavelength, Measurement between two consecutive rarefactions in a longitudinal wave, Mechanical, Type of energy does a sound wave have, Compression, Areas of increased pressure on a sound wave., Rarefaction, Spread out areas or areas of decreased pressure on a sound wave, Frequency, The number of wavelengths that pass a fixed point each second, Solid, Sound waves travel the fastest through this state.

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