Mach number is the ratio of —; 1) Velocity of sound and velocity of a body; 2) Velocity of two particles; 3) Velocity of a body and velocity of sound; 4) Frequency of two vibrating bodies
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2nd option is the right answer.. it is the ratio of speed of object to the sound speed.So, it is a dimensionless quantity.
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Hey !!
Option (1) Velocity of sound and velocity of a body.
Mach number is the ratio of Velocity of sound and velocity of a body.
Good luck !!
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