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Q: The frequency of an ultrasonic sound wave is greater than ……
  • A. 2000 Hz
  • B. 20 Hz
  • C. 200 Hz
  • D. 20000 Hz
Correct Answer: Option D - The frequency of an ultrasonic sound wave is more than 20,000 Hz, the infrasonic is less than 20 Hz, and the frequency of audio sound is between 20 and 20000 Hz.
D. The frequency of an ultrasonic sound wave is more than 20,000 Hz, the infrasonic is less than 20 Hz, and the frequency of audio sound is between 20 and 20000 Hz.

Explanations:

The frequency of an ultrasonic sound wave is more than 20,000 Hz, the infrasonic is less than 20 Hz, and the frequency of audio sound is between 20 and 20000 Hz.