3 terms

physical and perceptual dimensions of sound waves

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loudness
determined by the degree to which air molecules are pushed together and pulled apart; more vigarous vibrations of an object cause longer amplitude sound waves
pitch
determined by the frequency of sound waves produced by a vibrating object; the more sound waves per second the higher pitched the sound
timbre
determined by the complexity of the sound waves, the more little peaks and troughs the more complex the sound.