1) Vibrations are back and forth motions that produce ___________________________. a) sound b) pitch c) tone d) air 2) Air particles produce a (n) ___________________________ when they bump into one another. a) balloons b) sound waves c) vacuum d) noise 3) Energy is needed to make an object ____________________________. a) dance b) sound wave c) disappear d) vibrate 4) Sound cannot travel through a __________________________. a) vacuum b) air c) bottle d) sound wave 5) The distance from the top of one sound wave to the top of the next wave is a a) millimeter b) mile c) wavelength 6) The highness or lowness of a sound is its ___________________ a) amplitude b) pitch c) sound wave d) wavelength 7) The amount of energy in a sound wave is its__________________ a) amplitude b) frequency c) pitch d) sound wave 8) A sound that has been reflected off of a surface is an _______________________ a) pitch b) echo c) amplitude d) frequency 9) The loudness or softness of a sound is the _______________________ a) volume b) echo c) frequency d) vibration 10) _____________________ is the number of wavelengths that pass a point in one second. a) Vibration b) Pitch c) Volume d) Frequency

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