Two differences between ultrasonic and infrasonic waves. be careful there should be two differences no google copying. Answer fast as it is 20 points question
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Infrasound is sound that is below the lower limit of human hearing, below 20 Hz, and ultrasound is above the upper limit of human hearing, above 20,000 Hz. Infrasonic Sound has a frequency less than the audible frequency range. Less than 20 Hz.
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