What do we call when the sound of frequency will be below 20 Hz?
Correct answer: B. Infrasonic
- A. Audio sounds
- B. Infrasonic
- C. Ultrasonic
- D. Supersonics
Explanation
Sound below 20 hertz is called infrasonic sound and is generally below the lower limit of human hearing. Ultrasonic sound is the opposite category, with frequencies above 20,000 hertz.
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