The ratio of speed of source to the speed of sound is called

The ratio of speed of source to the speed of sound is called
  1. Reynold's number
  2. Mach number
  3. Complex number
  4. None of these

Solution

Mach number is the ratio of speed of source to the speed of sound. i.e. Mach number $= \frac{\text{Speed of source}}{\text{Speed of sound}}$

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