Which of the following describes the Mach number?

Question

Which of the following describes the Mach number?

 v_object

 [(v_object)/(v_sound)]

 [(v_sound)/(v_object)]

 v_sound

Answer 1

The Mach number tells us how many times an object is faster than sound.

For example, if an airplane flies at 2 Mach, then it is twice as fast as sound.

Therefore it is the second option.