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1. 20 to 20,000 Hz, although the range of frequencies individuals hear is greatly influenced by environmental factors.
2. Between 1 and 20 Hz.
3. Anything above the frequencies of audible sound, and nominally includes anything over 20,000 Hz.
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Audible sound for humans is 20 Hz to 20k Hz
Infrasonic is all the frequency below it
Ultra sonic is all frequencies above it
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