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A-LevelPhysicsMedical physicsFeb/Mar 2020Paper 4 Q48 Marks

4 (a) (i) Explain why ultrasound used in medical diagnosis is emitted in pulses. (ii) Explain the principles of the detection of ultrasound waves used in medical diagnosis. (b) The specific acoustic impedances Z of some media are given in Table 4.1. [Table 4.1]

Q: What topic does this question test?

This question tests Medical physics in A-Level Physics (syllabus code 9702). It is worth 8 marks.

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Physics Question

Topic

This structured question tests Medical physics in A-Level Physics (syllabus code 9702). It is worth 8 marks.

Source

This question appeared in the Cambridge A-Level Physics Feb/Mar 2020 examination, Paper 4 Variant 2.

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