1) range of hearing
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Ultrasound refers to sound with a frequency above 20,000 Hertz, whereas infrasound refers to sound with a frequency below 20 Hz, according to Dr. Colin France. ... Ultrasound scanning works by directing ultrasound at the body, allowing the surfaces of various tissues inside the body to reflect the ultrasound.
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While 20 to 20,000Hz forms the absolute borders of the human hearing range, our hearing is most sensitive in the 2000 - 5000 Hz frequency range. As far as loudness is concerned, humans can typically hear starting at 0 dB.
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