crest, the peak or high point of sound, trough, the low point of sound, wavelength, the distance between a point on one wave to the same point on the next wave, compression, particles pushed together, rarefaction, particles spread back out, frequency, number of times a sound vibrates per second, amplitude, the height of a sound wave, decibel, unit used to measure the loudness of sound, pitch, the highness or lowness of a sound, amplification, the process of making sound louder.

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