The speed of a body that has Mach number more than 1 is

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supersonic

subsonic

300 m/s

about 10 m/s

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Answer is Wrong!

This question was previously asked in

UPSC NDA-1 – 2017

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Mach number is defined as the ratio of the speed of an object in a medium to the speed of sound in that medium.
– Mach number = 1: Speed of the object equals the speed of sound (sonic).
– Mach number < 1: Speed of the object is less than the speed of sound (subsonic). - Mach number > 1: Speed of the object is greater than the speed of sound (supersonic).
– Mach number > 5: Speed of the object is much greater than the speed of sound (hypersonic).
The question asks for the speed of a body that has a Mach number more than 1, which corresponds to supersonic speed.

– Mach number is a dimensionless quantity representing the ratio of speed to the speed of sound.
– Mach > 1 means supersonic speed.
– Mach < 1 means subsonic speed. - Mach = 1 means sonic speed.

The speed of sound varies depending on the medium (e.g., air, water) and its properties (e.g., temperature, pressure). In dry air at 15°C at sea level, the speed of sound is approximately 340 m/s (around 1225 km/h or 761 mph). So, a speed of 300 m/s (Option C) is close to Mach 1 but not necessarily supersonic, and the statement about 10 m/s (Option D) is clearly subsonic.

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