Is it physically possible for humans to generate a sound that we can't hear?

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Farah Jarjous via Facebook

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Farah Jarjous via Facebook asked the Naked Scientists:
   
Hello,

Is it physically possible for humans to generate a sound wave that is at a higher/lower frequency that the one we can hear?

What do you think?
« Last Edit: 01/10/2010 17:30:02 by _system »

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Offline Geezer

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Would clapping our hands count? If so, I think some of the high frequency sound produced will be inaudible to humans.
There ain'ta no sanity clause, and there ain'ta no centrifugal force Šther.

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Offline Soul Surfer

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Also waving your hand will create subsonic frequencies in general you cannot hear these at all but if you wave your hand close to your ear you can just detect them by non linear effects. 
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