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Old Jan 27th 2009, 05:52 PM   #1
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frequencys.. wavelengths

cant someone help me out with this problem on how to figure it out?

Particles approximately 3.0 X 10-2 cm in diameter are to be scrubbed loose from machine parts in an aqueous ultrasonic cleaning bath. Above what frequency should the bath be operated to produce wavelengths of this size and smaller?
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Old Mar 6th 2009, 04:10 AM   #2
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For a wave to dislodge a target, the wavelength should beof the order of the size of the object. Too large a wavelength and it would simply'wash over' the object. Divide the vel of sound by particle dia to get the minimum cut off frequency.
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