Multiple choice

In which of the following techniques is Piezo-electric effect used?

  1. NMR

  2. PET

  3. Sonography

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To produce an ultrasound, a piezoelectric crystal has an alternating current applied across it. The piezoelectric crystal grows and shrinks depending on the voltage run through it. Running an alternating current through it causes it to vibrate at a high speed and to produce an ultrasound. This conversion of electrical energy to mechanical energy is known as the piezoelectric effect.

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