Question

What is the range of infrasound

Answer 1

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.

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Answer 2

Infra sounds are the sounds with frequencies less than 20 Hz.
Examples: Dogs , Children below 5 yrs of age can hear infra sounds.