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When an object travels slower than sound, the ratio in this equation is greater than one, and the equation does not have a real solution. Traveling at the speed of sound makes the ratio equal one and results in a Mach angle of ninety degrees. Above the speed of sound, the ratio is less than one and the Mach angle is less than ninety degrees. The faster the object moves, the narrower the cone of high pressure behind it becomes. Measuring the vertex angle is a way to determine the speed of a supersonic object.

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Reference 4: Screenshots from the Video below.

Mach Number

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Reference 5: http://www.nasa.../airplane/mach.html

This number was proposed by the Austrian phycisist and philosofer Ernst Mach in (1838-1916), one of the most notorius teorist phisicist.
The mach number is known as a measurement  or unit and is defined as the coeficient of the velocity of an object and the velocity of the sound.

This number is used to express the velocity of an object taking the sound velocity as a reference, something very interesting about the moment is that velocity of sound changes depending on the atmospheric conditions.

For example: With a higher altitude compare to the sea level, the speed of sound is less than the one found at the sea level.

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