Vibrations are back and forth motions that produce ___________________________., sound, pitch, tone, air, Air particles produce a (n) ___________________________ when they bump into one another., balloons, sound waves, vacuum, noise, Energy is needed to make an object ____________________________., dance, sound wave, disappear, vibrate, Sound cannot travel through a __________________________., vacuum, air, bottle, sound wave, The distance from the top of one sound wave to the top of the next wave is a, millimeter, mile, wavelength, The highness or lowness of a sound is its ___________________, amplitude, pitch, sound wave, wavelength, The amount of energy in a sound wave is its__________________, amplitude, frequency, pitch, sound wave, A sound that has been reflected off of a surface is an _______________________, pitch, echo, amplitude, frequency, The loudness or softness of a sound is the _______________________, volume, echo, frequency, vibration, _____________________ is the number of wavelengths that pass a point in one second., Vibration, Pitch, Volume, Frequency.

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