Physics 9702 · 24 Medical physics
24.1 Production and use of ultrasound
Explain ultrasound generation, define acoustic impedance, and calculate reflection coefficients and wave attenuation.
- Questions
- 38
- Years
- 2015–2026
- Multiple choice
- 0
- Written answer
- 38
- Average marks
- 7.9
Where this subtopic appears
- Paper 4variants 41, 42, 43, 4438
Questions by year
| Year | Feb/March | May/June | Oct/Nov | Total |
|---|---|---|---|---|
| 2026 | 1 | 1 | – | 2 |
| 2025 | 1 | – | – | 1 |
| 2023 | 1 | 2 | 2 | 5 |
| 2022 | – | – | 2 | 2 |
| 2021 | – | – | 1 | 1 |
| 2020 | 1 | 3 | 2 | 6 |
| 2019 | – | 3 | 1 | 4 |
| 2018 | 1 | 2 | 2 | 5 |
| 2017 | 1 | 3 | 1 | 5 |
| 2016 | 1 | 2 | 1 | 4 |
| 2015 | – | 3 | – | 3 |
