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Any sound out of the range 20Hz-20kHz can not be heard.
Wiki User
∙ 14y ago
Humans can't hear sounds that are below 20Hz (infrasound) or above 20,000Hz (ultrasound). Infrasound is produced by natural phenomena like earthquakes and by some animals, while ultrasound is used in medical imaging and by animals like bats for echolocation.
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