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Question

Ultrasound has a frequency of vibration


A

between 20 and 20000Hz

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B

below 20Hz

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C

above 20000Hz

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D

between 500 and 10000Hz

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Solution

The correct option is C

above 20000Hz


Ultrasonic wave:

  1. It is a longitudinal wave.
  2. When an electrical signal generator provides a pulse of electrical energy to a piezoelectric crystal in a transducer, the crystal vibrates, converting the electrical pulses into mechanical vibrations then ultrasonic waves are produced.
  3. The inaudible sound having frequency is more than 20kHz is termed as Ultrasonic wave.

Diagram of ultrasonic wave is shown as follows:

Hence, option (C) is the correct answer.


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