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Mach number (M ) is a dimensionless quantity representing the ratio of speed of an object moving through a fluid and the local speed of sound

M = U/a   U = velocity of the source relative to the medium   a =  speed of sound

Ultrasounds are sound waves with frequencies higher than the upper audible limit of human hearing.

Acoustic waves are a type of longitudinal waves that propagate by means of adiabatic compression and decompression

Answer

In fluid dynamics, the Mach number (M or Ma) (/mɑːx/; German: [maχ]) is a dimensionless quantity representing the ratio of flow velocity past a boundary to the local speed of sound. c is the speed of sound in the medium.

Difference is in their frequency, audible sound waves is between 12 Hz and 20,000 Hz, Ultrasound waves is any sound that has a frequency beyond the 20,000 Hz limit

 

Answer

Hi, ankita. Mach number is define as the speed of object with respect to "speed of sound(c)". i.e the speed of object how many times of the air's sound(340.29 m / s). Example- Suppose a JET flying at speed 1200 m/s. than this have 1200/c =3.52 mach.

Ultrasonic - Frequency more than 20000 kHz.

Acoustic waves are a type of longitudinalwaves that propagate by means of adiabatic compression and decompression.

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