As the velocity of the sound source approaches the speed of sound, the wave fronts ahead of the object begin to appear as:

a-separately distinguishable waves

b-a single wave front

c-cylindrical

d-a cone shape shockwave.

Term 1

and when the velocity of the sound source exceeds the speed of sound, the wave fronts form:

Term 2

a-separately distinguishable waves

b-a single wave front

c-cylindrical

d-a cone shape shockwave.

The correct answer is D

shock waves

Explanation:

When a body approaches the speed of sound in the media, the waves it emits are getting closer and closer to each other, the envelope (sum) results in a kind of cylindrical cone that is similar to that formed in a supersonic process

The correct answer is D

When the speed of sound is exceeded, the body goes faster than the wave, so the so-called shock waves are formed.

They carry a lot of energy