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The sound waves of frequency more than 20 khz are termed as:

Correct answer: D. Ultrasonic

  • A. Supersonic
  • B. Audible
  • C. Infrasonic
  • D. Ultrasonic

Explanation

Ultrasonic waves are sound waves whose frequencies are higher than those of waves normally audible to the human ear. ultrasonics, vibrations of frequencies greater than the upper limit of the audible range for humans-that is, greater than about 20 kilohertz.

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About Waves

Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.

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