difference between ultra sound and infra sound
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sound is the form of energy which makes us sensation of hearing while infrasound is sound of frequency less than 20 Hz
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infrasonic sound is sound vibrations with frequency of less than 20 per second.
ultra sound is sound vibrations with frequency of more than 20,000 per second.
ultra sound is sound vibrations with frequency of more than 20,000 per second.
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