infrasonic and ultrasonic sound range
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A longitudinal wave whose frequency is above the upper limit of audiblerange i.e. 20 kHz, is called ultrasonicwave. It is generated by very small sources. (c) Infrasonic wave : A longitudinal elastic wave whose frequency is below the audible rangei.e. 20 Hz, is called an infrason
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Infrasonic sound is a sound which has frequency that is less than 20 Hertz . This sound cannot be detected by human ear . Therefore they are inaudible . Example animal such as whales and elephants communicate through infrasonic sounds .
Ultrasonic sound is a sound which has frequency that is more than 20000 hertz or 20 kilo Hertz . This sound can also not be detected by human ear . Therefore they are also in audible . Example animal suggest dogs can hear ultrasonic sounds .
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