Question

Infrasound of range

Answer 1

less than 20 hz is known as infrasound and eg,dog,cat

Answer 2

Infrasound, sometimes referred to as low-frequency sound, is sound that is lower in frequency than 20 Hz or cycles per second, the "normal" limit of human hearing. Hearing. becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high.