Multiple choice

Which of the following is known as Mach number?

  1. It is the ratio of speed of an object moving through a fluid to the local speed of sound in that fluid.

  2. It is the range of audibility.

  3. It is the range of soothing sound measured in dB.

  4. Sounds with frequencies more than 20,000 Hz are called ultrasonic waves.

  5. It is the speed of sound in air at 0oC.
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A Correct answer
Explanation

 It is the ratio of speed of an object moving through a fluid to the local speed of sound in that fluid.

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