Hertz - The unit for frequency, Diffraction - Bending of sound waves, Vibration - Creates sound waves, Medium - A material that mechanical waves can travel through, Wavelength - Distance between two compressions in a longitudinal wave, Types of mechanical waves - Longitudinal, transverse, and surface, Compression - The part of a sound wave where the wave is close together, Rarefaction - Spread out areas of a sound wave, Frequency - The number of wavelengths that pass a fixed point each second,

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