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Unlike ordinary sound waves, the speed of a shock wave varies with its amplitude. The speed of a shock wave is always greater than the speed of sound in the fluid and decreases as the amplitude of the wave decreases. When the shock wave speed equals the normal speed, the shock wave dies and is reduced to an ordinary sound wave.

            
Reference: http://www.grc.nasa.gov/WWW/k-12/airplane/machang.html





       

In case that:
C = speed of sound
V = speed of the moving object
M = Mach number, would be M
So if an object move twice time faster that sound speed the Mach number would 2. |

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