Physics Wikia UK

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6 June 2014

5 June 2014

  • curprev 14:5514:55, 5 June 2014Poloniumll Message Wall contribs 223 bytes +223 Created page with "Ultra sound is sound that has frequencies greater than the human range of hearing which is 20-20,000 hertz, because of that it is not audible to human ear. It is commonly used..."