Multiple choice general knowledge science & technology

ultrasonic sound is ____.

  1. between 20 Hz to 20 kHz

  2. below 20 kHz

  3. equal to 20 kHz

  4. above 20 kHz
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ultrasonic sound is defined as sound waves with frequencies above 20 kHz (20,000 Hz), which is the upper limit of human hearing. The human audible range is 20 Hz to 20 kHz, so anything above 20 kHz is ultrasonic. Ultrasound is used in medical imaging, cleaning, and various industrial applications.

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