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Q. In fluid mechanics, Mach number is 1, if the speed of an object is equal to the ______?
Answer: Speed of sound
Notes: Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed medium through which the body is traveling. Mach 1 is equal to the speed of sound (which is 332 m/s or 1195 km/hr. ) An aircraft flying at Mach 2 is flying at twice the speed of sound in air, etc.

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📌 Question Number: 78 in Physics GK 16 - Sound Waves in the above course in App.