# 9702 P4 Hubble’s law and the Big Bang theory Topic Questions

> CIE IAL 9702 P4: every Hubble’s law and the Big Bang theo… topic question from 6 papers (2025–2026), grouped by syllabus point. 13 questions, 27 marks, with…

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CIE IAL · Physics · 9702 P4 · A Level

Every 9702 P4 Hubble’s law and the Big Bang theory topic question from the 2025–2027 syllabus, drawn from 6 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
- 4 subtopics
- 13 topic questions
- 6 papers
- 27 tagged marks
- [Back to Hubble’s law and the Big Bang theory](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/)
- [All paper codes](https://www.examsci.com/topics/)

Core finding

**4 recall and use Hubble’s law … and explain how this leads to the Big… is the most frequently assessed subtopic in Hubble’s law and the Big Bang theory, with 5 topic questions and 11 marks across 3 papers.** 1 understand that the lines in the emission and absorption… follows with 4 topic questions and 8 marks. The topic contains 4 subtopics, 13 topic questions and 27 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

- [4 recall and use Hubble’s law $v \approx H_0 d$ and explain how this leads to the Big Bang theory (candidates will only be required to use SI units)](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/4-recall-and-use-hubble-s-law-v-approx-h-0-d-and-explain-how-this-leads-to-the-big/) (3 papers) — 5 · 29.4%
- [1 understand that the lines in the emission and absorption spectra from distant objects show an increase in wavelength from their known values](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/1-understand-that-the-lines-in-the-emission-and-absorption-spectra-from-distant/) (4 papers) — 4 · 23.5%
- [2 use $\Delta\lambda / \lambda \approx \Delta f / f \approx v / c$ for the redshift of electromagnetic radiation from a source moving relative to an observer](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/2-use-delta-lambda-lambda-approx-delta-f-f-approx-v-c-for-the-redshift-of/) (4 papers) — 4 · 23.5%
- [3 explain why redshift leads to the idea that the Universe is expanding](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/3-explain-why-redshift-leads-to-the-idea-that-the-universe-is-expanding/) (4 papers) — 4 · 23.5%

### Marks by subtopic

marks

- [4 recall and use Hubble’s law $v \approx H_0 d$ and explain how this leads to the Big Bang theory (candidates will only be required to use SI units)](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/4-recall-and-use-hubble-s-law-v-approx-h-0-d-and-explain-how-this-leads-to-the-big/) (3 papers) — 11 · 31.4%
- [1 understand that the lines in the emission and absorption spectra from distant objects show an increase in wavelength from their known values](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/1-understand-that-the-lines-in-the-emission-and-absorption-spectra-from-distant/) (4 papers) — 8 · 22.9%
- [2 use $\Delta\lambda / \lambda \approx \Delta f / f \approx v / c$ for the redshift of electromagnetic radiation from a source moving relative to an observer](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/2-use-delta-lambda-lambda-approx-delta-f-f-approx-v-c-for-the-redshift-of/) (4 papers) — 8 · 22.9%
- [3 explain why redshift leads to the idea that the Universe is expanding](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/3-explain-why-redshift-leads-to-the-idea-that-the-universe-is-expanding/) (4 papers) — 8 · 22.9%

## 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 the lines in the emission and absorption spectra from distant objects show an increase in wavelength from their known values](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/1-understand-that-the-lines-in-the-emission-and-absorption-spectra-from-distant/)** | 4 | 4 | 8 | 2025–2026 | [Open topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/1-understand-that-the-lines-in-the-emission-and-absorption-spectra-from-distant/) |
| **[2 use $\Delta\lambda / \lambda \approx \Delta f / f \approx v / c$ for the redshift of electromagnetic radiation from a source moving relative to an observer](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/2-use-delta-lambda-lambda-approx-delta-f-f-approx-v-c-for-the-redshift-of/)** | 4 | 4 | 8 | 2025 | [Open topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/2-use-delta-lambda-lambda-approx-delta-f-f-approx-v-c-for-the-redshift-of/) |
| **[3 explain why redshift leads to the idea that the Universe is expanding](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/3-explain-why-redshift-leads-to-the-idea-that-the-universe-is-expanding/)** | 4 | 4 | 8 | 2025–2026 | [Open topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/3-explain-why-redshift-leads-to-the-idea-that-the-universe-is-expanding/) |
| **[4 recall and use Hubble’s law $v \approx H_0 d$ and explain how this leads to the Big Bang theory (candidates will only be required to use SI units)](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/4-recall-and-use-hubble-s-law-v-approx-h-0-d-and-explain-how-this-leads-to-the-big/)** | 5 | 3 | 11 | 2025 | [Open topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/4-recall-and-use-hubble-s-law-v-approx-h-0-d-and-explain-how-this-leads-to-the-big/) |

## Browse every topic question

- [1 understand that the lines in the emission and absorption spectra from distant objects show an increase in wavelength from their known values](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/1-understand-that-the-lines-in-the-emission-and-absorption-spectra-from-distant/) — 4 question items · 4 papers — 8 marks · 2025–2026
- [2 use $\Delta\lambda / \lambda \approx \Delta f / f \approx v / c$ for the redshift of electromagnetic radiation from a source moving relative to an observer](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/2-use-delta-lambda-lambda-approx-delta-f-f-approx-v-c-for-the-redshift-of/) — 4 question items · 4 papers — 8 marks · 2025
- [3 explain why redshift leads to the idea that the Universe is expanding](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/3-explain-why-redshift-leads-to-the-idea-that-the-universe-is-expanding/) — 4 question items · 4 papers — 8 marks · 2025–2026
- [4 recall and use Hubble’s law $v \approx H_0 d$ and explain how this leads to the Big Bang theory (candidates will only be required to use SI units)](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/hubble-s-law-and-the-big-bang-theory/4-recall-and-use-hubble-s-law-v-approx-h-0-d-and-explain-how-this-leads-to-the-big/) — 5 question items · 3 papers — 11 marks · 2025

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## Topic question rules and edge cases

**How many subtopics does Hubble’s law and the Big Bang theory contain?**

This page lists 4 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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