Which frequency ranges classify ultrasound, audible sound, and infrasound?

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Multiple Choice

Which frequency ranges classify ultrasound, audible sound, and infrasound?

Explanation:
The important idea is how we separate sound by frequency relative to what humans can hear. Humans typically hear from about 20 Hz up to 20 kHz. Frequencies below that range are infrasonic, and frequencies above that range are ultrasonic. So the standard classification is: infrasonic sound is less than 20 Hz, audible sound is about 20 Hz to 20 kHz, and ultrasonic sound is greater than 20 kHz. This is why the option describing ultrasound as above 20 kHz, audible as 20 Hz to 20 kHz, and infrasonic as below 20 Hz matches the usual definitions. Keep in mind the exact endpoints can vary slightly with age and measurement, but 20 Hz and 20 kHz are the conventional boundaries.

The important idea is how we separate sound by frequency relative to what humans can hear. Humans typically hear from about 20 Hz up to 20 kHz. Frequencies below that range are infrasonic, and frequencies above that range are ultrasonic. So the standard classification is: infrasonic sound is less than 20 Hz, audible sound is about 20 Hz to 20 kHz, and ultrasonic sound is greater than 20 kHz. This is why the option describing ultrasound as above 20 kHz, audible as 20 Hz to 20 kHz, and infrasonic as below 20 Hz matches the usual definitions. Keep in mind the exact endpoints can vary slightly with age and measurement, but 20 Hz and 20 kHz are the conventional boundaries.

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