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Lessons for this topic haven’t been written yet. The objectives below show exactly what the syllabus expects, so you can plan with them in the meantime.
What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.
Understand that applying a p.d. across a piezo-electric crystal changes its shape, and that changing the crystal’s shape makes it generate an e.m.f.
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Understand how a piezo-electric transducer generates and detects ultrasound waves.
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Understand how diagnostic information about internal structures can be obtained from the reflection of ultrasound pulses at boundaries between tissues.
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Define the specific acoustic impedance of a medium as Z = ρc, where c is the speed of sound in that medium.
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Use I_R / I₀ = (Z₁ − Z₂)² / (Z₁ + Z₂)² for the intensity reflection coefficient at a boundary between two media.
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Recall and use I = I₀e^(−μx) for the attenuation of ultrasound in matter.
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