Conversation so far:
Where does sound originate from and how is it produced
A sound originates in the vibration of an object, which makes the air or another substance around the object vibrate. The vibration moves outward in the form of a wave.
what is the frequency range that is audible to humans
Humans normally hear sound frequencies between approximately 20 Hz and 20,000 Hz

Question: is ultrasound audible
Self-contained rewrite: is ultrasound audible by humans