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What is the formula for mach number?(a) M=\(\frac{V}{a}\)(b) M=\(\frac{a}{V}\)(c) V=\(\frac{a}{M}\)(d) a=\(\frac{M}{V}\)The question was posed to me in final exam.My query is from Measurement of Mach Number in portion Atmosphere and Air Data Measurement of Aircraft Performance

Answer»

The CORRECT choice is (a) M=\(\frac{V}{a}\)

The best EXPLANATION: The formula for MACH NUMBER is M=\(\frac{V}{a}\) where M=mach number, V=velocity, a=speed of sound. There is no unit for mach number as it is a ratio of speed of the object to the speed of sound in the surrounding air.



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