The speed of a body that has Mach number more than 1 is

  1. supersonic
  2. subsonic
  3. 300 m/s
  4. about 10 m/s

Answer

Mach number (M) is the ratio of the speed of a body to the speed of sound in the surrounding medium. If the body has Mach number greater than 1, the speed of the body is greater than the speed of the sound.

For Subsonic, M < 1

For Supersonic, M > 1

For Sonic, M = 1

For Hypersonic, M > 5

The correct option is A.

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