# 9702 P4 Production and use of ultrasound Topic Questions

> CIE IAL 9702 P4: every Production and use of ultrasound topic question from 4 papers (2025–2026), grouped by syllabus point. 15 questions, 33 marks, with…

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CIE IAL · Physics · 9702 P4 · A Level

Every 9702 P4 Production and use of ultrasound topic question from the 2025–2027 syllabus, drawn from 4 papers (2025–2026) and grouped by syllabus point. Each row opens a page listing the exact question numbers, marks and a direct link into the paper. These are questions by topic, not full papers, so you can revise one topic at a time.

- 9702 P4
- 5 subtopics
- 15 topic questions
- 4 papers
- 33 tagged marks
- [Back to Production and use of ultrasound](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/)
- [All paper codes](https://www.examsci.com/topics/)

Core finding

**5 use … for the intensity reflection coefficient of a boundary… is the most frequently assessed subtopic in Production and use of ultrasound, with 6 topic questions and 13 marks across 4 papers.** 1 understand that a piezo-electric crystal changes shape… follows with 4 topic questions and 10 marks. The topic contains 5 subtopics, 15 topic questions and 33 marks in total. Rows count only the parts tagged to that subtopic, keep the same colour in both charts and repeat paper count, tagged marks and year range in the native table.

## Topic question count and mark distribution

Subtopics are on the vertical axis and sorted from highest to lowest. Only the parts whose knowledge graph matches a subtopic are counted for it, and percentages are each row's share of the tagged total in that chart. A part tagged to several subtopics is counted in each bar, so the bars are not a partition of the topic total.

### Questions by subtopic

question items

- [5 use $I_R / I_0 = (Z_1 - Z_2)^2 / (Z_1 + Z_2)^2$ for the intensity reflection coefficient of a boundary between two media](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/5-use-i-r-i-0-z-1-z-2-2-z-1-z-2-2-for-the-intensity-reflection-coefficient-of-a/) (4 papers) — 6 · 30.0%
- [1 understand that a piezo-electric crystal changes shape when a p.d. is applied across it and that the crystal generates an e.m.f. when its shape changes](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/1-understand-that-a-piezo-electric-crystal-changes-shape-when-a-p-d-is-applied-across/) (4 papers) — 4 · 20.0%
- [2 understand how ultrasound waves are generated and detected by a piezoelectric transducer](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/2-understand-how-ultrasound-waves-are-generated-and-detected-by-a-piezoelectric/) (4 papers) — 4 · 20.0%
- [4 define the specific acoustic impedance of a medium as $Z = \rho c$, where c is the speed of sound in the medium](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/4-define-the-specific-acoustic-impedance-of-a-medium-as-z-rho-c-where-c-is-the-speed/) (4 papers) — 4 · 20.0%
- [6 recall and use $I = I_0 e^{-\mu x}$ for the attenuation of ultrasound in matter](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/6-recall-and-use-i-i-0-e-mu-x-for-the-attenuation-of-ultrasound-in-matter/) (2 papers) — 2 · 10.0%

### Marks by subtopic

marks

- [5 use $I_R / I_0 = (Z_1 - Z_2)^2 / (Z_1 + Z_2)^2$ for the intensity reflection coefficient of a boundary between two media](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/5-use-i-r-i-0-z-1-z-2-2-z-1-z-2-2-for-the-intensity-reflection-coefficient-of-a/) (4 papers) — 13 · 28.3%
- [1 understand that a piezo-electric crystal changes shape when a p.d. is applied across it and that the crystal generates an e.m.f. when its shape changes](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/1-understand-that-a-piezo-electric-crystal-changes-shape-when-a-p-d-is-applied-across/) (4 papers) — 10 · 21.7%
- [2 understand how ultrasound waves are generated and detected by a piezoelectric transducer](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/2-understand-how-ultrasound-waves-are-generated-and-detected-by-a-piezoelectric/) (4 papers) — 10 · 21.7%
- [4 define the specific acoustic impedance of a medium as $Z = \rho c$, where c is the speed of sound in the medium](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/4-define-the-specific-acoustic-impedance-of-a-medium-as-z-rho-c-where-c-is-the-speed/) (4 papers) — 8 · 17.4%
- [6 recall and use $I = I_0 e^{-\mu x}$ for the attenuation of ultrasound in matter](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/6-recall-and-use-i-i-0-e-mu-x-for-the-attenuation-of-ultrasound-in-matter/) (2 papers) — 5 · 10.9%

## Subtopic comparison matrix

Curriculum order is by syllabus number, then alphabetically. Every row links to the matching past-paper question list.

| Subtopic | Topic questions | Papers | Marks | Years | |
| --- | --- | --- | --- | --- | --- |
| **[1 understand that a piezo-electric crystal changes shape when a p.d. is applied across it and that the crystal generates an e.m.f. when its shape changes](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/1-understand-that-a-piezo-electric-crystal-changes-shape-when-a-p-d-is-applied-across/)** | 4 | 4 | 10 | 2025–2026 | [Open topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/1-understand-that-a-piezo-electric-crystal-changes-shape-when-a-p-d-is-applied-across/) |
| **[2 understand how ultrasound waves are generated and detected by a piezoelectric transducer](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/2-understand-how-ultrasound-waves-are-generated-and-detected-by-a-piezoelectric/)** | 4 | 4 | 10 | 2025–2026 | [Open topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/2-understand-how-ultrasound-waves-are-generated-and-detected-by-a-piezoelectric/) |
| **[4 define the specific acoustic impedance of a medium as $Z = \rho c$, where c is the speed of sound in the medium](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/4-define-the-specific-acoustic-impedance-of-a-medium-as-z-rho-c-where-c-is-the-speed/)** | 4 | 4 | 8 | 2025–2026 | [Open topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/4-define-the-specific-acoustic-impedance-of-a-medium-as-z-rho-c-where-c-is-the-speed/) |
| **[5 use $I_R / I_0 = (Z_1 - Z_2)^2 / (Z_1 + Z_2)^2$ for the intensity reflection coefficient of a boundary between two media](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/5-use-i-r-i-0-z-1-z-2-2-z-1-z-2-2-for-the-intensity-reflection-coefficient-of-a/)** | 6 | 4 | 13 | 2025–2026 | [Open topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/5-use-i-r-i-0-z-1-z-2-2-z-1-z-2-2-for-the-intensity-reflection-coefficient-of-a/) |
| **[6 recall and use $I = I_0 e^{-\mu x}$ for the attenuation of ultrasound in matter](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/6-recall-and-use-i-i-0-e-mu-x-for-the-attenuation-of-ultrasound-in-matter/)** | 2 | 2 | 5 | 2025–2026 | [Open topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/6-recall-and-use-i-i-0-e-mu-x-for-the-attenuation-of-ultrasound-in-matter/) |

## Browse every topic question

- [1 understand that a piezo-electric crystal changes shape when a p.d. is applied across it and that the crystal generates an e.m.f. when its shape changes](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/1-understand-that-a-piezo-electric-crystal-changes-shape-when-a-p-d-is-applied-across/) — 4 question items · 4 papers — 10 marks · 2025–2026
- [2 understand how ultrasound waves are generated and detected by a piezoelectric transducer](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/2-understand-how-ultrasound-waves-are-generated-and-detected-by-a-piezoelectric/) — 4 question items · 4 papers — 10 marks · 2025–2026
- [4 define the specific acoustic impedance of a medium as $Z = \rho c$, where c is the speed of sound in the medium](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/4-define-the-specific-acoustic-impedance-of-a-medium-as-z-rho-c-where-c-is-the-speed/) — 4 question items · 4 papers — 8 marks · 2025–2026
- [5 use $I_R / I_0 = (Z_1 - Z_2)^2 / (Z_1 + Z_2)^2$ for the intensity reflection coefficient of a boundary between two media](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/5-use-i-r-i-0-z-1-z-2-2-z-1-z-2-2-for-the-intensity-reflection-coefficient-of-a/) — 6 question items · 4 papers — 13 marks · 2025–2026
- [6 recall and use $I = I_0 e^{-\mu x}$ for the attenuation of ultrasound in matter](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/production-and-use-of-ultrasound/6-recall-and-use-i-i-0-e-mu-x-for-the-attenuation-of-ultrasound-in-matter/) — 2 question items · 2 papers — 5 marks · 2025–2026

## Other topics in 9702 P4

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- [Electric field of a point charge 8 question items](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/electric-field-of-a-point-charge/)
- [Electric fields and field lines 7 question items](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/electric-fields-and-field-lines/)
- [Electric force between point charges 12 question items](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/electric-force-between-point-charges/)
- [Electric potential 26 question items](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/electric-potential/)

## Topic question rules and edge cases

**How many subtopics does Production and use of ultrasound contain?**

This page lists 5 subtopics tagged to the current syllabus. They are ordered by syllabus number, then alphabetically, and each row opens a page of matching past-paper questions.

**How are the subtopic question and mark totals calculated?**

A multiple-choice question contributes one item and its marks to every subtopic it is tagged with. A structured question contributes one item per tagged part, and that part’s marks; untagged parts of the same question are not counted here. A part tagged to several subtopics therefore appears under each of them.

**Why do some subtopics have no numbered prefix?**

Practical-skills statements and some syllabus bullets are unnumbered. Numbered statements come first; unnumbered statements and ties are sorted alphabetically.

**Is the LaTeX rendered without JavaScript?**

Yes. Subtopics that contain formulas are converted to static KaTeX HTML during the build, and the KaTeX stylesheet is served from the same site.

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