What are infrasonics?
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Infrasound, sometimes referred to as low-frequency sound, is sound that is lower in frequency than 20 Hz or cycles per second, the "normal" limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high.
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The normal frequency range that is audible for humans is 20Hz to 20,000Hz. Sounds that are having frequency parameters below 20Hz are known as infrasonics.
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