What is another word for the sound barrier?

A. destructive interference

B. light speed

C. Doppler effect

D. speed of sound

Sound barrier is also given as Destructive Interference

Here interference is the phenomenon in which two sounds of same frequency superimpose and create a new sound of different amplitude.

Here if the amplitude of this new sound is zero or very small than the resultant sound intensity will be zero.

This is known as sound barrier.

So sound barrier = Destructive Interference