When the speed of any object exceeds the speed of sound, it is said to be travelling at which speed?

Correct option is B

The correct answer is (b) Supersonic.
When an object travels faster than the speed of sound in a given medium, it is said to be traveling at supersonic speed. The speed of sound, also known as Mach 1, varies depending on the medium (e.g., approximately 343 meters per second in air at sea level and at 20°C). Objects moving at supersonic speeds produce shock waves, leading to phenomena such as sonic booms.
Additional Information:
· Subsonic : Subsonic speeds are those below the speed of sound. Most commercial aircraft operate at subsonic speeds.
· Hyposonic : This term is not commonly used in the context of describing speeds relative to the speed of sound.
· Infrasonic : Infrasonic refers to sound waves with frequencies below the audible range for humans (below 20 Hz), not to speed.