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For a particular gas, Mach number behind the shock wave is a function of which all parameters ahead of the shock wave. Choose the correct option.

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For a particular gas, Mach number behind the shock wave is a function of which all parameters ahead of the shock wave. Choose the correct option.

(a) Mach number, pressure

(b) Mach number only

(c) Mach number, temperature

(d) Mach number, temperature, pressure

This question was addressed to me in exam.

Question is taken from Flow Compressible in chapter Normal Shock Waves of Aerodynamics

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Right answer is (b) Mach number only

The explanation: The remarkable result for the normal shock wave is that for a given gas (given gamma), the Mach number ahead of the normal shock wave is a function of the Mach number ahead of the normal shock wave only, irrespective of pressure, density, temperature etc. The values are tabulated and found in gas tables for reference.

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