ocr: What are soundwaves? Sound waves are a series of compressions squeezing air) and rarefactions (releasing air). The distance between the tWo is called the wavelength. The shorter the wavelength, the higher the sound. The speed that the sound wave travels at is called its trequency, and this is measured in units called hertz (Hz). Sound travels at about 760 mph through air, but at over 3,400 mph through water. In a sound wave, air particles vibrate back and forth in the same direction as the wave is travelling. Different sounds have ditterently shaped waves. The number of times an object vibrate ...
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