Mach number

Q.  Which of the following is/are true?

1) Speed of Mach 10 is equal to the speed of sound.
2) Mach number is dimensionless quantity.
- Published on 25 May 16

a. Only 1
b. Only 2
c. Both 1 and 2
d. Neither 1 nor 2

ANSWER: Only 2
 
  • Speed of Mach 1 is equal to the speed of sound. Therefore, Mach 0.65 is about 65% of the speed of sound (subsonic), and Mach 1.35 is about 35% faster than the speed of sound (supersonic).
  • The Mach number is a dimensionless quantity representing the ratio of the speed of a body to the speed of sound in the surrounding medium.
  • It is helpful to measure speeds relative to speed of sound.

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