Sound of frequency below 20 Hz is:___________?
Correct answer: B. Infrasonic
- A. Audiosonic
- B. Infrasonic
- C. Ultrasonic
- D. Supersonic
Explanation
Infrasonic sound has a frequency below 20 hertz, below the lower limit of normal human hearing. Ultrasonic sound is above about 20,000 hertz.
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