# WPH15 Topic Questions — Edexcel IAL Physics Unit 5 > Edexcel IAL Physics Unit 5: 4 topics with 731 WPH15 topic questions from 20 papers (2020–2026). Browse questions by topic, then open the exact past-paper… - Canonical HTML: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/ - Markdown mirror: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/index.md --- Edexcel IAL · Physics · A Level Practise WPH15 topic questions by topic. 4 topics from the 2018–current syllabus are drawn from 20 papers (2020–2026). Each topic below opens every past-paper question tagged to its syllabus points. - WPH15 - 20 papers - 731 topic questions - 1,800 marks - Syllabus 2018–current - [Browse WPH15 papers](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/) - [All paper codes](https://www.examsci.com/topics/) Core finding **Astrophysics and Cosmology leads WPH15 with 303 topic questions and 725 marks across 20 papers.** Nuclear Decay follows with 178 topic questions and 455 marks. The current 2018–current dataset covers 4 topics, 731 topic questions and 1,800 marks. Each MCQ or structured part counts as one item, and each topic counts only the parts tagged to it, so the ranking reflects exam exposure rather than the number of question stems. Rows also carry paper count, mark total and year range for cross-unit comparison. The native table reproduces every figure in curriculum order. ## Topic question count and mark distribution Topics are on the vertical axis and sorted from highest to lowest. Only the parts whose knowledge graph matches a topic are counted for that topic, and percentages are each row's share of the tagged total in that chart. A part tagged to several topics is counted in each bar, so the bars are not a partition of the unit total. ### Questions by topic question items - [Astrophysics and Cosmology](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/astrophysics-and-cosmology/) (20 papers) — 303 · 41.1% - [Nuclear Decay](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/nuclear-decay/) (20 papers) — 178 · 24.2% - [Oscillations](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/oscillations/) (20 papers) — 145 · 19.7% - [Thermodynamics](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/) (20 papers) — 111 · 15.1% ### Marks by topic marks - [Astrophysics and Cosmology](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/astrophysics-and-cosmology/) (20 papers) — 725 · 39.8% - [Nuclear Decay](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/nuclear-decay/) (20 papers) — 455 · 25.0% - [Thermodynamics](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/) (20 papers) — 337 · 18.5% - [Oscillations](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/oscillations/) (20 papers) — 306 · 16.8% ## Topic comparison matrix Curriculum order is by syllabus number, then alphabetically. Every topic links to its subtopic index. | Topic | Subtopics | Topic questions | Papers | Marks | Years | | | --- | --- | --- | --- | --- | --- | --- | | **[Astrophysics and Cosmology](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/astrophysics-and-cosmology/)** | 18 | 303 | 20 | 725 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/astrophysics-and-cosmology/) | | **[Nuclear Decay](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/nuclear-decay/)** | 10 | 178 | 20 | 455 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/nuclear-decay/) | | **[Oscillations](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/oscillations/)** | 11 | 145 | 20 | 306 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/oscillations/) | | **[Thermodynamics](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/)** | 8 | 111 | 20 | 337 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/) | ## Browse all topic questions - [Astrophysics and Cosmology](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/astrophysics-and-cosmology/) — 303 question items · 20 papers — 18 subtopics · 725 marks · 2020–2026 - [Nuclear Decay](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/nuclear-decay/) — 178 question items · 20 papers — 10 subtopics · 455 marks · 2020–2026 - [Oscillations](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/oscillations/) — 145 question items · 20 papers — 11 subtopics · 306 marks · 2020–2026 - [Thermodynamics](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/) — 111 question items · 20 papers — 8 subtopics · 337 marks · 2020–2026 ## Other Physics paper codes - [U1 771 question items](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-1-wph11/) - [U2 733 question items](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-2-wph12/) - [U3 463 question items](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-3-wph13/) - [U4 728 question items](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/) - [U6 357 question items](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-6-wph16/) ## Topic questions: rules and edge cases **Where can I find WPH15 topic questions?** This page groups every WPH15 topic question by topic and syllabus point. Open a topic to see the question numbers, marks and the session each one comes from, then follow the link into the original paper. **How many topics are in the current WPH15 syllabus?** This page lists 4 topics tagged to the current syllabus across 20 WPH15 papers (2020–2026). Topics are ordered by syllabus number, then alphabetically. **How are question counts and marks calculated?** Each MCQ counts as one question item and each structured part counts as one item. Marks come from the official part marks. Only parts whose knowledge graph matches a topic are counted, and a part tagged to more than one topic is counted against each topic, so topic rows describe exam exposure rather than a partition of the paper. **Why is there no topic chart on the D1 index?** The D1 index intentionally stops at the paper-code level. Topic names are only shown after a code is selected, which prevents two units from claiming the same topic phrase or URL. **Which sessions are included?** All sessions tagged to the current syllabus are included, covering 2020–2026. Questions without a recognised syllabus tag are treated as current so they do not disappear from the index. --- Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/