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Vacuum Sound Barrier

Lolly-Ink asked
Last Modified: 2012-05-05
I have learnt that sound doesn't travel through a vacuum.

If you surrounded an object with a vacuum layer, what is the minimum width of the vacuum layer required such that it acts as a sound barrier - no sound gets in and no sound gets out.

Another way of thinking of this question is: what is the maximum distance between atoms allowed such that sound can still be transferred?
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