Question

A piezoelectric crystal is used to produce the ultrasound waves. What kind of ultrasound is produced?

(a) Pressure wave ultrasound

(b) Electrical wave ultrasound

(c) Sound wave ultrasound

(d) Simple ultrasound

This question was addressed to me in an international level competition.

My question is from Ultrasound topic in section Diagnostic Investigation via Imaging Techniques of Clinical Science

Answer 1

The correct choice is (a) Pressure wave ultrasound

The explanation: A piezoelectric crystal is a special transducer which converts mechanical energy into electrical energy and vice-versa. Thus, when the electrical impulses are given to the transducer, it is converted into mechanical energy. The transducer starts vibrating causing a pressure difference and the ultrasound waves are produced.