An object moving at a speed greater than that of sound is said to be moving at:

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Infrasonic speed

Sonic speed

Ultrasonic speed

Supersonic speed

answer is D.

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Detailed Solution

Concept- Infrasonic and ultrasonic are terminologies used to describe the frequency of the sound vibration, whereas sonic speed is another name for the speed of sound.
The thing is traveling faster than the speed of sound. Supersonic speed is the phrase used to describe that speed. An object is considered to be supersonic if it is going faster than the speed of sound. The sonic boom phenomenon occurs when an item travels at supersonic speeds. A sonic boom is a type of gigantic sonic explosion (i.e., a loud sound with a massive vibration) that is seen when an item reaches supersonic speed and breaks through the sound speed barrier.
The speed of sound in air is one mach, which is typically used to designate supersonic objects that go faster than one mach. Jet aircraft fly at speeds between Mach 5 and 10. Anything associated with sound is referred to as sonic. The speed of sound itself is referred to as sonic speed.
In this context, the terms sonic and supersonic are used to describe the speed of sound, but infrasonic and ultrasonic are used to describe the frequency of sound vibration and have no connection to speed. The term "infrasonic sound" refers to sounds with frequencies less than 2 Hertz. The lowest frequency at which sound may be perceived. Ultrasonic sound is defined as sound with a frequency greater than 20,000 Hertz, or the highest frequency audible to humans. The human ear is incapable of hearing either infrasonic or ultrasonic noises.
Hence, the correct option is 4.

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