classify sound waves in the basis of frequency.
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where is the waves ???
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1. infrasonic sound - less than 20 hz
2.Audible sound -20 to 20,000 hz
3.ultrasonic sound - over 20,000 hz unnoticeable
2.Audible sound -20 to 20,000 hz
3.ultrasonic sound - over 20,000 hz unnoticeable
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