Is it possible to produce ultra sound by cracking a whip?

Question

It is very important!

Answer 1

Do you mean ultra sound, or super sonic?

ultra sound is simply sound which is above the frequency that we humans can hear. A whip would produce that.

If you mean super sonic, then a whip can produce that too. Basically the whip is moving so fast that the ends are going faster than the speed of sound. The characteristic crack a whip makes is actually a sonic boom. This was not realised until the advent of high speed cameras as people assumed it was the ends of whip hitting itself.

Answer 2

Yes.  It's also possible to produce ultrasound by hitting a nail with a hammer, snapping your fingers, etc.  Most "noise" sounds are a broad spectrum of frequencies, including some above the range of hearing (ultrasound).

Whether you can get anything useful out of the whipcrack's ultrasound is a different question, with the answer probably being no.