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The characteristic Mach number and Mach number are related. Which of these is not correct?

The characteristic Mach number and Mach number are related. Which of these is not correct? Correct Answer M→∞, M*→0

The characteristic Mach number and the Mach number behave almost in a similar pattern. The only difference if when the Mach number tends to infinity, the characteristic Mach number tends to a finite value. This finite value depends only on gamma is never zero.

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