What kind of a sound will a subsonic object make?

Question

I get that going at the speed of sound creates sonic a sonic boom. But what happens when the object is close to that speed, but not there yet? Say at 1200 kmph.

Is the sound louder with the size? If so, how loud?

For example, how different would a bullet, a baseball, and a bowling ball, going at the same speed sound?

In: 0

Answer 1

It doesn’t get significantly louder until a shockwave forms. Sound from an approaching object will not be audible until the object is much closer than would happen if it were stationary. Volume changes do not occur until air begins to compress when it can no longer leap out of the way of a transonic object.