Explain how a piezoelectric transducer can be used to detect ultrasound waves.
Explain how the reflection of ultrasound at a boundary between two different media depends on their acoustic impedances. In your answer, state how acoustic impedance is related to the physical properties of the medium, and include the mathematical formula for the fraction of intensity reflected.
25 exam-style questions on OCR A A Level Physics Medical imaging, covering Using X-rays, Diagnostic methods in medicine, and Using ultrasound. Each one has a worked solution and a mark scheme showing where the marks go.