What do you understand by the term ultrasonic vibrations?

  • A
    Sounds with frequency less than $20 \,Hz$
  • B
    Sounds with frequency between $20 \,Hz$ and $20,000 \,Hz$
  • C
    Sounds with frequency higher than $20,000 \,Hz$
  • D
    Sounds with frequency exactly $20,000 \,Hz$

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