Dear Graybeard,
In physics of gas (such as air), we treat it as continuous medium and work with its macroscopic properties, so average molecules momentum (velocity) of air was manifested as its pressure!
Now, when we applied an external sound energy to air medium, the propagation of sound wave is occurred. This is the process of compression and rarefaction of air medium pressure (pressure above and below its normal pressure), i.e. the mechanism is stress-strain action in air medium!
In (a) which is a constructive interference of wave (addition of compression and addition of rarefaction) occur at the output, and then we get output sound energy. In (b) which is a destructive interference of wave occur, i.e. the energy from one compression part cancels the energy of another rarefaction part. So get NO we get output sound energy!
Sincerely,
Nimit
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www.vacuum-mechanics.com .


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