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Mr. Dubey • 100.64K Points
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Q. Sound waves of a frequency beyond the hearing range of the human ear are referred to as ultrasonic waves or vibrations, and the term embraces all vibrational waves of frequency greater than approximately:

  • (A) 20 kHz
  • (B) 2 MHz
  • (C) 2 kHz
  • (D) 200 kHz
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