Question

Opinion on infrasonic and ultrasound

Answer 1

infrasonic sounds are two sounds which are below 20 hertz these sounds are inaudible to humans and ultrasonic sounds are those sounds which are above 20000 hertz and the sound are too inaudible by humans
animals like bat, whales, dolphins, elephants, etc. can produce and hear both infrasonic and ultrasonic sounds to communicate

Answer 2

Sounds below 20 Hertz cannot be heard by humans (is inaudible) and is called infrasonic sound.

Sounds above 20000 Hertz cannot be heard by humans and is called ultrasonic sound.