Infrasound frequencies are defined as frequencies below what threshold?

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Multiple Choice

Infrasound frequencies are defined as frequencies below what threshold?

Explanation:
Infrasound is the portion of sound below the lower limit of human hearing. Humans typically hear from about 20 Hz up to around 20 kHz, so anything below roughly 20 Hz is considered infrasonic. Therefore, the threshold used to define infrasonic is 20 Hz. Frequencies above that (like 200 Hz or 2000 Hz) are audible. A very low frequency such as 2 Hz is also infrasonic, but the standard boundary is 20 Hz.

Infrasound is the portion of sound below the lower limit of human hearing. Humans typically hear from about 20 Hz up to around 20 kHz, so anything below roughly 20 Hz is considered infrasonic. Therefore, the threshold used to define infrasonic is 20 Hz. Frequencies above that (like 200 Hz or 2000 Hz) are audible. A very low frequency such as 2 Hz is also infrasonic, but the standard boundary is 20 Hz.

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