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Q: What is the frequency of Infrasonic waves?
  • A. More than 20Hz
  • B. Between 20Hz to 2000Hz
  • C. Less than 20Hz
  • D. Between 20Hz to 2000Hz
Correct Answer: Option C - Sound waves with a frequency below 20Hz are called infrasonic sound waves.
C. Sound waves with a frequency below 20Hz are called infrasonic sound waves.

Explanations:

Sound waves with a frequency below 20Hz are called infrasonic sound waves.