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Beyond 20Hz to 20,000Hz - Speaker Related Companies - Products & Services Feature Article By LIS STAFF
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USGS Earthquakes's tweet - "Cool EQ Fact: Humans can detect sounds in the frequency range 20-20,000 Hertz. Most earthquake waves have a frequency of less than 20 Hz, so the waves themselves
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Sound Sound waves are –Longitudinal –Pressure Waves Infrasonic – less than 20 Hz Audible – between 20 and 20,000 Hz Ultrasonic – greater than 20,000 Hz. - ppt download
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Sound Frequency Ranges For Infrasound, Audible And Ultrasound Waves And The Corresponding Animals That Can Hear
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