More information would be appreciated, anyways if the wave is longitudinal such as air.. and it's assumed to be ideal you can use the berniouli principle that is Pressure is greater where flow speed is smaller. In order words, pressure is inversely proportional to speed.
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You cannot use the Bernoulli equation for describing shock waves. Bernoulli's equation is used to describe the energetics of fluid flow through a pipe.
A shock wave is defined as high amplitude pressure waves (which is very analogous to sound). These pressure waves are longitudinal; they propagate through alternating "waves" of high and low pressures:
A shock wave is defined as high amplitude pressure waves (which is very analogous to sound). These pressure waves are longitudinal; they propagate through alternating "waves" of high and low pressures:
