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Title: Sound vibrations with frequencies less than 20 Hz are called Post by: ppk on Mar 19, 2012 Sound vibrations with frequencies less than 20 Hz are called
A) infrasonics. B) ultrasonics. C) supersonics. D) infrared. E) megasonics. Title: Re: Sound vibrations with frequencies less than 20 Hz are called Post by: bio_man on Mar 22, 2012 Content hidden
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