Question

An object moving at a speed greater than that of sound is moving at

• A. ultrasonic speed
• B. sonic speed
• C. supersonic speed
• D. infrasonic speed

Answer 1

The correct option is C

supersonic speed

An explanation for the correct option:

Option C: Supersonic speed.

When an object travels at a speed greater than that of the speed of sound in air, then the object is said to be moving with Supersonic speed.

Explanation for the incorrect options:

Option A: Ultrasonic speed.

The speed of ultrasonic sound in air is $340m{s}^{-1}$which is not greater than the speed of sound in air.

Option B: Sonic speed.

Sonic speed is nothing but the speed of a sound wave in a medium.

Option D: Infrasonic speed.

If an object moves with a speed less than that of the speed of sound in air, that is termed infrasonic speed.

Hence, option (C) is the correct answer.