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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
The sound of more than 20,000 Hz is inaudible to a human, but also the sound of more frequency is perceived louder by humans. How is it possible that a human cannot
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Information | Free Full-Text | Combining Visual Contrast Information with Sound Can Produce Faster Decisions
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Beyond 20Hz to 20,000Hz - Speaker Related Companies - Products & Services Feature Article By LIS STAFF
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Not All Humans Can Hear This Sound. Can You? - Take the 20hz - 20000hz Audio Spectrum Test - YouTube
![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 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](https://pbs.twimg.com/media/ExVkRIWWYAQom1X.png)
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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