Question

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 1

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.