1) Ultrasonic and infrasonic sound name
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Sounds of frequencies below 20 Hz are called infrasonic sound or infrasound. Frequencies higher than 20 kHz are called ultrasonic sound or ultrasound.
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communicate using ultrasonic hearing. infrasound, is a low frequency sound less than 20Hz . animals that can communicate using infrasonic sound are: rhinos, hippos, elephants, whales, octopus, pigeons, squid, Cuttlefish, cod, guinea fowl.
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