A-LevelPhysicsMedical physics9702/41 · May/June 2021 · Q45 Marks
Outline the use of ultrasound to obtain diagnostic information about internal body structures.
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [1] (ultrasound) pulse
- [1] reflected at boundaries
- [1] gel is used to minimise reflection at skin
- [1] generated and detected by quartz crystal
- [1] time delay between generation and detection gives information about depth
- [1] intensity (of reflected wave) gives information about nature of boundary
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