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Q: Sound waves with frequency below the audible range are called-
  • A. Ultrasonic
  • B. Ultrasound
  • C. Supersonic
  • D. Infrasonic
Correct Answer: Option D - Sound waves with a frequency between 20Hz to 20000Hz are called audible sound waves and sound waves with a frequency below 20Hz (below the Audible range) are called infrasonic sound waves.
D. Sound waves with a frequency between 20Hz to 20000Hz are called audible sound waves and sound waves with a frequency below 20Hz (below the Audible range) are called infrasonic sound waves.

Explanations:

Sound waves with a frequency between 20Hz to 20000Hz are called audible sound waves and sound waves with a frequency below 20Hz (below the Audible range) are called infrasonic sound waves.