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A-LevelPhysicsMedical physics9702/42 · Feb/Mar 2017 · Q44 Marks

Explain the main principles of the generation of ultrasound waves for medical use.

Mark scheme

Marking points from the official mark scheme (Feb/Mar 2017). The mark or mark type is shown in brackets.

[B1] piezo-electric/quartz crystal/transducer
[B1] alternating p.d. applied across crystal/transducer
[B1] causes crystal to vibrate/resonate
[B1] crystal resonates at ultrasound frequencies/ crystal's natural frequency is in the ultrasound range/alternating p.d. is in ultrasound frequency range

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About this question

Topic: Medical physics, A-Level Physics (syllabus 9702). Structured question, 4 marks.
Source: A-Level Physics, Feb/Mar 2017 Paper 4 Variant 2, question 4.

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