# Topic Questions: 164 be able to use the equation, intensity $I=\frac{L}{4\pi d^{2}}$ where L is luminosity and d is distance from the source — WPH15 Astrophysics and Cosmology > 34 WPH15 Astrophysics and Cosmology topic questions (92 marks) on 164 be able to use the equation, intensity …… — 18 papers, 2020–2026. Open the exact… - Canonical HTML: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/astrophysics-and-cosmology/164-be-able-to-use-the-equation-intensity-i-frac-l-4-pi-d-2-where-l-is-luminosity-and/ - Markdown mirror: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/astrophysics-and-cosmology/164-be-able-to-use-the-equation-intensity-i-frac-l-4-pi-d-2-where-l-is-luminosity-and/index.md --- Edexcel IAL · Physics · WPH15 · Astrophysics and Cosmology 34 WPH15 Astrophysics and Cosmology topic questions are tagged to this syllabus point across 18 papers (2020–2026). Only the parts whose knowledge graph matches this syllabus statement are counted, and the table shows which parts of each question are involved. - 34 topic questions - 18 papers - 92 tagged marks - 11.2% of topic questions - 12.7% of topic marks - 2020–2026 - Syllabus 2018–current - [All WPH15 Astrophysics and Cosmology topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/astrophysics-and-cosmology/) - [All paper codes](https://www.examsci.com/topics/) Core finding **This Astrophysics and Cosmology syllabus point appears in 18 WPH15 papers across 2020–2026, contributing 34 topic questions and 92 marks.** The most recent appearance is WPH15/01 January 2026. That equals 11.2% of the 303 topic questions and 12.7% of the 725 marks tagged to Astrophysics and Cosmology. Only parts tagged to this subtopic are counted, so a four-part question can contribute one item and one part's marks. The table lists every matching question, its tagged parts and marks, with a link back to the paper page. Sessions are newest first, so the statement can be traced back through the full paper history. ## Topic questions by session Newest sessions first. Parts and marks count only the parts tagged to this subtopic; “x of y parts” shows how much of the question is tagged elsewhere. Select the paper cell to open the matching question on the paper page, or use **Go to Practice Hub** to answer that exact question in the Interactive Practice Hub. | Paper | Question | Type | Parts | Marks | Difficulty | Practice | | --- | --- | --- | --- | --- | --- | --- | | [**WPH15/01** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2026-january-wph15-01/#q-3) | **Q3** Unit for Intensity - Edexcel IAL Physics Jan 2026 Q3 | MCQ | MCQ · 1 part | 1 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=33df4133-3f97-49c4-8770-848b232eb7b1&question_id=2ff387ac-7c69-4429-bb9e-92b27012ee54&source_detail=WPH15%2F01+January+2026) | | [**WPH15/01** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2026-january-wph15-01/#q-7) | **Q7** Standard Candle Intensity Ratio - Edexcel IAL Physics Jan 2026 Q7 | MCQ | MCQ · 1 part | 1 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=33df4133-3f97-49c4-8770-848b232eb7b1&question_id=5e0b5656-152a-4594-9d1f-0d1ce75c8b01&source_detail=WPH15%2F01+January+2026) | | [**WPH15/02** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2026-january-wph15-02/#q-1) | **Q1** Stellar Brightness and Distance - Edexcel IAL Physics Jan 2026 Q1 | MCQ | MCQ · 1 part | 1 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f63db731-6514-40da-90c9-5232288471cb&question_id=6a60aa4f-e7dd-47d3-aec6-aabf1f620094&source_detail=WPH15%2F02+January+2026) | | [**WPH15/01** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-october-wph15-01/#q-6) | **Q6** Astrophysics - Star Intensity and Distance - Edexcel IAL Physics Oct 2025 Q6 | MCQ | MCQ · 1 part | 1 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a7fbae2d-76be-4ac0-9bd4-df3ed119c92f&question_id=88d63fbf-f617-42e3-a1cb-73529115d7ee&source_detail=WPH15%2F01+October+2025) | | [**WPH15/01** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-october-wph15-01/#q-21) | **Q21** Astrophysics - Distance Measurements - Edexcel IAL Physics Oct 2025 Q21 | FRQ | 1 of 5 parts ((b)(ii)) | 3 of 13 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a7fbae2d-76be-4ac0-9bd4-df3ed119c92f&question_id=51fc83df-efa9-4328-ac5d-078b85d5f03e&source_detail=WPH15%2F01+October+2025) | | [**WPH15/02** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-october-wph15-02/#q-6) | **Q6** Stellar Intensity and Distance - Edexcel IAL Physics Oct 2025 Q6 | MCQ | MCQ · 1 part | 1 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e7442241-a09d-4872-a697-6e37dca804e8&question_id=3639c3e7-8832-473a-8562-c7d3e00f1cd9&source_detail=WPH15%2F02+October+2025) | | [**WPH15/02** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-october-wph15-02/#q-21) | **Q21** Stellar Distance and Orbital Calculations - Edexcel IAL Physics Oct 2025 Q21 | FRQ | 2 of 5 parts ((b)(ii), (c)(ii)) | 4 of 13 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e7442241-a09d-4872-a697-6e37dca804e8&question_id=01bbaf42-92ef-4c98-895e-a20e232e1e4a&source_detail=WPH15%2F02+October+2025) | | [**WPH15/01** June 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-june-wph15-01/#q-14) | **Q14** Distance Measurement Methods - Edexcel IAL Physics June 2025 Q14 | FRQ | 1 of 3 parts ((b)(ii)) | 3 of 6 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2e30fb2a-dfff-4c32-b30f-fefebd92c451&question_id=03870a91-b31a-4857-a1dd-af142d07e092&source_detail=WPH15%2F01+June+2025) | | [**WPH15/01** June 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-june-wph15-01/#q-19) | **Q19** Tau Ceti Stellar Properties - Edexcel IAL Physics June 2025 Q19 | FRQ | 1 of 3 parts ((b)) | 5 of 10 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2e30fb2a-dfff-4c32-b30f-fefebd92c451&question_id=651f39be-77ce-4602-99a7-eeef7fe1d9b8&source_detail=WPH15%2F01+June+2025) | | [**WPH15/01** June 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-june-wph15-01/#q-20) | **Q20** Nuclear decay of Plutonium-238 - Edexcel IAL Physics June 2025 Q20 | FRQ | 1 of 5 parts ((c)) | 2 of 15 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2e30fb2a-dfff-4c32-b30f-fefebd92c451&question_id=76d6a898-a4e9-4290-9145-1f8b564d3f28&source_detail=WPH15%2F01+June+2025) | | [**WPH15/01** January 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-january-wph15-01/#q-16) | **Q16** Cepheid Variables and Standard Candles - Edexcel IAL Physics Jan 2025 Q16 | FRQ | 1 of 3 parts ((b)(ii)) | 2 of 7 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=40c335c3-e98a-43c8-b5d1-d1abedfaca1a&question_id=29879328-a12d-49cf-90ac-f5144d9313c5&source_detail=WPH15%2F01+January+2025) | | [**WPH15/01** October 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2024-october-wph15-01/#q-3) | **Q3** Edexcel IAL Physics Unit 5 Oct 2024 Q3 | MCQ | MCQ · 1 part | 1 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=3e10632c-bdcc-44a6-afc4-5f4f7a30978e&question_id=5cde93f2-cfaa-4d7f-8a04-04c44c104e58&source_detail=WPH15%2F01+October+2024) | | [**WPH15/01** October 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2024-october-wph15-01/#q-15) | **Q15** Edexcel IAL Physics Unit 5 Oct 2024 Q15 | FRQ | 1 of 2 parts ((b)) | 4 of 7 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=3e10632c-bdcc-44a6-afc4-5f4f7a30978e&question_id=069e0eeb-0766-4fbe-b129-730c8355517e&source_detail=WPH15%2F01+October+2024) | | [**WPH15/01** June 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2024-june-wph15-01/#q-15) | **Q15** Melting Ice Floe - Edexcel IAL Physics Unit 5 Jun 2024 Q15 | FRQ | 1 of 2 parts ((b)) | 6 of 9 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=fd4de767-0a74-4fd7-9f81-6fb7daf58d01&question_id=61459150-52a3-41df-b3e9-1f581f17f1b1&source_detail=WPH15%2F01+June+2024) | | [**WPH15/01** June 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2024-june-wph15-01/#q-16) | **Q16** Epsilon-Eridani Radiation and Doppler Shift - Edexcel IAL Physics Unit 5 Jun 2024 Q16 | FRQ | 1 of 2 parts ((a)) | 5 of 8 on the paper | Hard | [Go to Practice Hub](https://www.examsci.com/practice?set_id=fd4de767-0a74-4fd7-9f81-6fb7daf58d01&question_id=11cd64f5-49f2-4455-b234-7ac96b2ee4fb&source_detail=WPH15%2F01+June+2024) | | [**WPH15/01** January 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2024-january-wph15-01/#q-16) | **Q16** Astrophysics and Cosmology - Edexcel IAL Physics Jan 2024 Q16 | FRQ | 1 of 2 parts ((a)) | 4 of 8 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=81ae8d95-9845-43d2-85aa-56edeba0f606&question_id=64c1601b-9da3-4370-8bb6-ad8225469ac2&source_detail=WPH15%2F01+January+2024) | | [**WPH15/01** January 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2024-january-wph15-01/#q-18) | **Q18** Astrophysics and Cosmology - Edexcel IAL Physics Jan 2024 Q18 | FRQ | 1 of 3 parts ((b)) | 4 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=81ae8d95-9845-43d2-85aa-56edeba0f606&question_id=29f24309-77ef-4797-a253-2a2308af967b&source_detail=WPH15%2F01+January+2024) | | [**WPH15/01** January 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2023-january-wph15-01/#q-18) | **Q18** Stellar Parallax and Standard Candles - Edexcel IAL Physics Jan 2023 Q18 | FRQ | 1 of 4 parts ((b)(ii)) | 3 of 9 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=79fd249d-5274-48b7-a2fe-e660c6fd21a0&question_id=0416d128-7ea3-43ca-8e89-483656a76172&source_detail=WPH15%2F01+January+2023) | | [**WPH15/01** January 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2023-january-wph15-01/#q-21) | **Q21** Kapteyn's Star and Planet Kapteyn-b - Edexcel IAL Physics Jan 2023 Q21 | FRQ | 1 of 3 parts ((a)(ii)) | 4 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=79fd249d-5274-48b7-a2fe-e660c6fd21a0&question_id=dd24c0e0-aefb-48a0-a58a-9a76d44e0c3a&source_detail=WPH15%2F01+January+2023) | | [**WPH15/01** October 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-october-wph15-01/#q-9) | **Q9** Stellar Luminosity Ratio - Edexcel IAL Physics Oct 2022 Q9 | MCQ | MCQ · 1 part | 1 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=11a7a1e1-92c0-4c27-923f-84fabaf236e5&question_id=2da9034e-e3e4-4a20-bc23-801e12e553d0&source_detail=WPH15%2F01+October+2022) | | [**WPH15/01** October 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-october-wph15-01/#q-13) | **Q13** Standard Candles and Distance - Edexcel IAL Physics Oct 2022 Q13 | FRQ | 1 part | 6 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=11a7a1e1-92c0-4c27-923f-84fabaf236e5&question_id=8c781801-8df8-4a5c-9957-1c90bcd1c4d4&source_detail=WPH15%2F01+October+2022) | | [**WPH15/01** June 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-june-wph15-01/#q-11) | **Q11** Distance of Galaxy M81 Using Standard Candle - Edexcel IAL Physics Jun 2022 Q11 | FRQ | 1 part | 3 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=9a093fb4-7c1b-4987-9e36-33b3e20c2b25&question_id=8dab4070-57ba-40b4-bd4d-88494f07ac36&source_detail=WPH15%2F01+June+2022) | | [**WPH15/01** January 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-january-wph15-01/#q-8) | **Q8** Luminosity and Intensity of Stars - Edexcel IAL Physics Jan 2022 Q8 | MCQ | MCQ · 1 part | 1 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=ba0935d7-8bd2-4880-a14a-07ef68b24285&question_id=2643d08d-9758-4ab6-bce1-f46b01a2523a&source_detail=WPH15%2F01+January+2022) | | [**WPH15/01** January 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-january-wph15-01/#q-19) | **Q19** Stellar Parallax and H-R Diagrams - Edexcel IAL Physics Jan 2022 Q19 | FRQ | 1 of 5 parts ((b)) | 3 of 18 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=ba0935d7-8bd2-4880-a14a-07ef68b24285&question_id=f00210c4-13dd-4cfb-9853-016df19d48f5&source_detail=WPH15%2F01+January+2022) | | [**WPH15/02** January 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-january-wph15-02/#q-7) | **Q7** Standard Candle Method Parameters - Edexcel IAL Physics Jan 2022 Q7 | MCQ | MCQ · 1 part | 1 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=23304130-a638-4c40-b130-1921931842df&question_id=3af9dad7-a220-440a-9230-01afe75f70ba&source_detail=WPH15%2F02+January+2022) | | [**WPH15/02** January 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-january-wph15-02/#q-21) | **Q21** Solar Power on Mars and Solar Radius - Edexcel IAL Physics Jan 2022 Q21 | FRQ | 2 of 3 parts ((b), (c)) | 8 of 10 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=23304130-a638-4c40-b130-1921931842df&question_id=7f8130ef-42b2-407a-9148-d71032715266&source_detail=WPH15%2F02+January+2022) | | [**WPH15/01** October 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2021-october-wph15-01/#q-11) | **Q11** Distance of Sirius - Edexcel IAL Physics Oct 2021 Unit 5 Q11 | FRQ | 1 part | 2 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=85f00adf-61bf-4290-b7e1-556838a91d6f&question_id=0afbd03f-5285-4582-9399-b67234e8f2d1&source_detail=WPH15%2F01+October+2021) | | [**WPH15/01** June 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2021-june-wph15-01/#q-12) | **Q12** Fast Radio Bursts as Standard Candles - Edexcel IAL Physics Jun 2021 Q12 | FRQ | 2 of 3 parts ((b)(i), (b)(ii)) | 6 of 7 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=ab093dfb-339d-4a8a-9997-6d539dfdc6b8&question_id=029b923e-2c7f-4143-a9c6-cb6470263f34&source_detail=WPH15%2F01+June+2021) | | [**WPH15/01** January 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2021-january-wph15-01/#q-6) | **Q6** Astrophysics - luminosity and intensity comparison | MCQ | MCQ · 1 part | 1 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2e0b1233-9e48-4222-bc71-6c120258396f&question_id=7272f74d-f7d8-44ff-a6b9-b486e6ae1fac&source_detail=WPH15%2F01+January+2021) | | [**WPH15/01** October 2020 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2020-october-wph15-01/#q-14) | **Q14** Sun's Luminosity and Mass Loss - Edexcel IAL Physics Oct 2020 Q14 | FRQ | 1 of 2 parts ((a)) | 2 of 4 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1a3931f7-4a72-41eb-af5a-0d315b2148a6&question_id=a4a2a0ce-1fe0-43ed-9a0f-0bb3ca567906&source_detail=WPH15%2F01+October+2020) | | [**WPH15/01** October 2020 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2020-october-wph15-01/#q-16) | **Q16** Stellar Characteristics of Alnilam and Mintaka - Edexcel IAL Physics Oct 2020 Q16 | FRQ | 1 of 4 parts ((d)) | 3 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1a3931f7-4a72-41eb-af5a-0d315b2148a6&question_id=9c163041-4c0e-4b71-9ff8-11ee50a56f52&source_detail=WPH15%2F01+October+2020) | ## Related topic questions in Astrophysics and Cosmology - 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Other parts of the same questions are assessed under different statements and are excluded from this page. **Which papers include this subtopic?** The table lists every matching session from 2020–2026. Each row links to the question anchor on the paper page, where the full paper context and practice entry point are available. **Why can one question appear under several subtopics?** The parts of one question can assess different syllabus statements. Each part is counted under its own subtopics, so the same question stem can appear on several subtopic pages while each page lists only the parts and marks tagged to that statement. **Can I practise these questions with AI marking?** Yes. Open a paper from the table and use the Interactive Practice Hub entry point. The page itself is static HTML so search engines and retrieval agents can read the full question list without executing JavaScript. --- Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/astrophysics-and-cosmology/164-be-able-to-use-the-equation-intensity-i-frac-l-4-pi-d-2-where-l-is-luminosity-and/