a measure of how high or low a sound is pitch High Pitch Low Pitch the greatest distance that a wave rises from its rest, or calm amplitude moving areas of high and low pressure sound wave measure of the distance between a point on one wave and the same point on the next wave wave length a series of vibrations that can be heard sound a measure of the sound energy reaching your ear loudness or rate of travel of a sound wave speed of sound FAST sound wave made by an object moving faster than the speed of sound sonic boom sounds like reflection of sound waves echo Hello, Hello, Hello area where air is pushed together by vibrations vibration compression AIR vibration n