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Yesterday, 10:26 PM EST Anonymous
 
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Change: Khurshid ultrasound is sound with frequency greater than 20,000 cycles per second or 20kHz. Audible sound sensed by the human ear are in the range of 20Hz to 20kHz. Advantages Ultrasound can be directed as a beam. Ultrasound obeys the laws of reflection and refraction. Ultrasound is reflected   View changes from previous version. (Word count: 2398)
Sep 13 2008, 9:29 AM EDT Anonymous
 
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Jul 8 2008, 9:04 AM EDT AndyC
 
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Jul 8 2008, 8:55 AM EDT AndyC
 
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Jul 8 2008, 8:54 AM EDT AndyC
 
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Jan 14 2008, 10:12 PM EST Anonymous
 
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Jun 27 2007, 10:15 PM EDT gmack
 
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Jun 27 2007, 9:17 AM EDT gmack
 
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Jun 27 2007, 9:11 AM EDT gmack
 
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Jun 27 2007, 9:02 AM EDT gmack
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Apr 23 2007, 12:10 AM EDT AndyC
 
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Apr 16 2007, 11:03 AM EDT AndyC
 
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Apr 16 2007, 10:55 AM EDT AndyC
Rename 
rename No content added or deleted.
Apr 16 2007, 10:54 AM EDT Anonymous
 
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Apr 16 2007, 10:46 AM EDT Anonymous
 
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Apr 16 2007, 10:39 AM EDT Anonymous
 
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Apr 16 2007, 10:28 AM EDT Anonymous
 
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Apr 16 2007, 10:08 AM EDT Anonymous
 
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Apr 16 2007, 9:59 AM EDT Anonymous
 
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Apr 16 2007, 9:49 AM EDT Anonymous
 
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