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Acoustic waves are a type of wave that travels at the speed of sound. It travels by compressing and decompressing the medium it is traveling though. Ultrasonic waves are acoustic waves that are so high in frequency that humans can’t hear them; however, infrasonic waves are sound waves that are lower in frequency than what humans can hear. A subsonic wave is a wave that is traveling slower than the speed of sound and a supersonic waves travels faster. By definition, a sound wave travels at the speed of sound which varies depending on the medium through which it’s traveling.