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
is ultrasound audible by humans
Sound waves above 20 kHz are known as ultrasound and are not audible to humans.
is infrasound audible by humans
Infrasound is sound waves with frequencies lower than 20 Hz. Sounds of such low frequency are too low for humans to hear.

Question: who can hear the sound
Self-contained rewrite: who can hear infrasound