A) electroencephalography
B) electrocardiography
C) magneto encephalography
D) sonography
Correct Answer: D
Solution :
The crystal of lead zirconatetitanate widely used in ultrasound imaging techniques (sonography). In this medical technique these crystals are act as transducers (are substances that have the property of being able to convert one form of energy into another). The ultrasonic waves are produced from a transducer and travel through human tissues at a velocity of some 1500 metres per second. After reading to a object or surface now wave is reflected back. These echoes are received by the apparatus and changed into electric current and shown on a cathode ray tube.
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