Exam-style question
Try this first
Which of the following best describes the generation of ultrasound pulses?.
- A.They are created by electrical signals in the air.
- B.They are produced by vibrating piezoelectric crystals.
- C.They are emitted from a laser source.
- D.They are generated by mechanical pressure alone.
Model answer
What a good answer should say
- They are produced by vibrating piezoelectric crystals.
Explanation
Why this works
Ultrasound pulses are generated by vibrating piezoelectric crystals, which convert electrical energy into mechanical energy, producing sound waves.
Common mistake
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