# WPH14 Nuclear and Particle Physics Topic Questions

> Edexcel IAL WPH14: every Nuclear and Particle Physics topic question from 20 papers (2020–2026), grouped by syllabus point. 278 questions, 656 marks, with…

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Edexcel IAL · Physics · WPH14 · A Level

Every WPH14 Nuclear and Particle Physics topic question from the 2018–current syllabus, drawn from 20 papers (2020–2026) 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.

- WPH14
- 14 subtopics
- 278 topic questions
- 20 papers
- 656 tagged marks
- [Back to Nuclear and Particle Physics](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/)
- [All paper codes](https://www.examsci.com/topics/)

Core finding

**114 understand the role of electric and magnetic fields in particle… is the most frequently assessed subtopic in Nuclear and Particle Physics, with 37 topic questions and 100 marks across 19 papers.** 121 know that in the standard quark-lepton model particles… follows with 34 topic questions and 63 marks. The topic contains 14 subtopics, 278 topic questions and 656 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

- [114 understand the role of electric and magnetic fields in particle accelerators (linac and cyclotron) and detectors (general principles of ionisation and deflection only)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/114-understand-the-role-of-electric-and-magnetic-fields-in-particle-accelerators/) (19 papers) — 37 · 10.9%
- [121 know that in the standard quark-lepton model particles can be classified as: • baryons (e.g. neutrons and protons), which are made from three quarks • mesons (e.g. pions), which are made from a quark and an antiquark • leptons (e.g. electrons and neutrinos), which are fundamental particles • photons and that the symmetry of the model predicted the top quark](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/121-know-that-in-the-standard-quark-lepton-model-particles-can-be-classified-as/) (20 papers) — 34 · 10.0%
- [119 be able to use MeV and GeV (energy) and MeV/$c^{2}$, GeV/$c^{2}$ (mass) and convert between these and SI units](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/119-be-able-to-use-mev-and-gev-energy-and-mev-c-2-gev-c-2-mass-and-convert-between/) (19 papers) — 33 · 9.7%
- [115 be able to derive and use the equation $r=\frac{p}{BQ}$ for a charged particle in a magnetic field](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/115-be-able-to-derive-and-use-the-equation-r-frac-p-bq-for-a-charged-particle-in-a/) (19 papers) — 31 · 9.1%
- [112 understand how large-angle alpha particle scattering gives evidence for a nuclear model of the atom and how our understanding of atomic structure has changed over time](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/112-understand-how-large-angle-alpha-particle-scattering-gives-evidence-for-a-nuclear/) (20 papers) — 29 · 8.5%
- [123 understand how to use laws of conservation of charge, baryon number and lepton number to determine whether a particle interaction is possible](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/123-understand-how-to-use-laws-of-conservation-of-charge-baryon-number-and-lepton/) (19 papers) — 29 · 8.5%
- [113 understand that electrons are released in the process of thermionic emission and how they can be accelerated by electric and magnetic fields](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/113-understand-that-electrons-are-released-in-the-process-of-thermionic-emission-and/) (17 papers) — 27 · 7.9%
- [116 be able to apply conservation of charge, energy and momentum to interactions between particles and interpret particle tracks](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/116-be-able-to-apply-conservation-of-charge-energy-and-momentum-to-interactions/) (15 papers) — 27 · 7.9%
- [118 be able to use the equation $\Delta E=c^{2}\Delta m$ in situations involving the creation and annihilation of matter and antimatter particles](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/118-be-able-to-use-the-equation-delta-e-c-2-delta-m-in-situations-involving-the/) (18 papers) — 23 · 6.8%
- [120 understand situations in which the relativistic increase in particle lifetime is significant (use of relativistic equations not required)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/120-understand-situations-in-which-the-relativistic-increase-in-particle-lifetime-is/) (15 papers) — 19 · 5.6%
- [117 understand why high energies are required to investigate the structure of nucleons](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/117-understand-why-high-energies-are-required-to-investigate-the-structure-of-nucleons/) (14 papers) — 15 · 4.4%
- [111 understand what is meant by nucleon number (mass number) and proton number (atomic number)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/111-understand-what-is-meant-by-nucleon-number-mass-number-and-proton-number-atomic/) (14 papers) — 14 · 4.1%
- [124 be able to write and interpret particle equations given the relevant particle symbols.](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/124-be-able-to-write-and-interpret-particle-equations-given-the-relevant-particle/) (10 papers) — 12 · 3.5%
- [122 know that every particle has a corresponding antiparticle and be able to use the properties of a particle to deduce the properties of its antiparticle and vice versa](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/122-know-that-every-particle-has-a-corresponding-antiparticle-and-be-able-to-use-the/) (7 papers) — 10 · 2.9%

### Marks by subtopic

marks

- [114 understand the role of electric and magnetic fields in particle accelerators (linac and cyclotron) and detectors (general principles of ionisation and deflection only)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/114-understand-the-role-of-electric-and-magnetic-fields-in-particle-accelerators/) (19 papers) — 100 · 11.8%
- [115 be able to derive and use the equation $r=\frac{p}{BQ}$ for a charged particle in a magnetic field](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/115-be-able-to-derive-and-use-the-equation-r-frac-p-bq-for-a-charged-particle-in-a/) (19 papers) — 91 · 10.8%
- [119 be able to use MeV and GeV (energy) and MeV/$c^{2}$, GeV/$c^{2}$ (mass) and convert between these and SI units](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/119-be-able-to-use-mev-and-gev-energy-and-mev-c-2-gev-c-2-mass-and-convert-between/) (19 papers) — 90 · 10.7%
- [116 be able to apply conservation of charge, energy and momentum to interactions between particles and interpret particle tracks](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/116-be-able-to-apply-conservation-of-charge-energy-and-momentum-to-interactions/) (15 papers) — 89 · 10.5%
- [112 understand how large-angle alpha particle scattering gives evidence for a nuclear model of the atom and how our understanding of atomic structure has changed over time](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/112-understand-how-large-angle-alpha-particle-scattering-gives-evidence-for-a-nuclear/) (20 papers) — 76 · 9.0%
- [123 understand how to use laws of conservation of charge, baryon number and lepton number to determine whether a particle interaction is possible](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/123-understand-how-to-use-laws-of-conservation-of-charge-baryon-number-and-lepton/) (19 papers) — 68 · 8.1%
- [113 understand that electrons are released in the process of thermionic emission and how they can be accelerated by electric and magnetic fields](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/113-understand-that-electrons-are-released-in-the-process-of-thermionic-emission-and/) (17 papers) — 65 · 7.7%
- [118 be able to use the equation $\Delta E=c^{2}\Delta m$ in situations involving the creation and annihilation of matter and antimatter particles](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/118-be-able-to-use-the-equation-delta-e-c-2-delta-m-in-situations-involving-the/) (18 papers) — 65 · 7.7%
- [121 know that in the standard quark-lepton model particles can be classified as: • baryons (e.g. neutrons and protons), which are made from three quarks • mesons (e.g. pions), which are made from a quark and an antiquark • leptons (e.g. electrons and neutrinos), which are fundamental particles • photons and that the symmetry of the model predicted the top quark](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/121-know-that-in-the-standard-quark-lepton-model-particles-can-be-classified-as/) (20 papers) — 63 · 7.5%
- [120 understand situations in which the relativistic increase in particle lifetime is significant (use of relativistic equations not required)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/120-understand-situations-in-which-the-relativistic-increase-in-particle-lifetime-is/) (15 papers) — 45 · 5.3%
- [124 be able to write and interpret particle equations given the relevant particle symbols.](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/124-be-able-to-write-and-interpret-particle-equations-given-the-relevant-particle/) (10 papers) — 28 · 3.3%
- [117 understand why high energies are required to investigate the structure of nucleons](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/117-understand-why-high-energies-are-required-to-investigate-the-structure-of-nucleons/) (14 papers) — 27 · 3.2%
- [122 know that every particle has a corresponding antiparticle and be able to use the properties of a particle to deduce the properties of its antiparticle and vice versa](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/122-know-that-every-particle-has-a-corresponding-antiparticle-and-be-able-to-use-the/) (7 papers) — 20 · 2.4%
- [111 understand what is meant by nucleon number (mass number) and proton number (atomic number)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/111-understand-what-is-meant-by-nucleon-number-mass-number-and-proton-number-atomic/) (14 papers) — 17 · 2.0%

## 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 | |
| --- | --- | --- | --- | --- | --- |
| **[111 understand what is meant by nucleon number (mass number) and proton number (atomic number)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/111-understand-what-is-meant-by-nucleon-number-mass-number-and-proton-number-atomic/)** | 14 | 14 | 17 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/111-understand-what-is-meant-by-nucleon-number-mass-number-and-proton-number-atomic/) |
| **[112 understand how large-angle alpha particle scattering gives evidence for a nuclear model of the atom and how our understanding of atomic structure has changed over time](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/112-understand-how-large-angle-alpha-particle-scattering-gives-evidence-for-a-nuclear/)** | 29 | 20 | 76 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/112-understand-how-large-angle-alpha-particle-scattering-gives-evidence-for-a-nuclear/) |
| **[113 understand that electrons are released in the process of thermionic emission and how they can be accelerated by electric and magnetic fields](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/113-understand-that-electrons-are-released-in-the-process-of-thermionic-emission-and/)** | 27 | 17 | 65 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/113-understand-that-electrons-are-released-in-the-process-of-thermionic-emission-and/) |
| **[114 understand the role of electric and magnetic fields in particle accelerators (linac and cyclotron) and detectors (general principles of ionisation and deflection only)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/114-understand-the-role-of-electric-and-magnetic-fields-in-particle-accelerators/)** | 37 | 19 | 100 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/114-understand-the-role-of-electric-and-magnetic-fields-in-particle-accelerators/) |
| **[115 be able to derive and use the equation $r=\frac{p}{BQ}$ for a charged particle in a magnetic field](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/115-be-able-to-derive-and-use-the-equation-r-frac-p-bq-for-a-charged-particle-in-a/)** | 31 | 19 | 91 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/115-be-able-to-derive-and-use-the-equation-r-frac-p-bq-for-a-charged-particle-in-a/) |
| **[116 be able to apply conservation of charge, energy and momentum to interactions between particles and interpret particle tracks](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/116-be-able-to-apply-conservation-of-charge-energy-and-momentum-to-interactions/)** | 27 | 15 | 89 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/116-be-able-to-apply-conservation-of-charge-energy-and-momentum-to-interactions/) |
| **[117 understand why high energies are required to investigate the structure of nucleons](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/117-understand-why-high-energies-are-required-to-investigate-the-structure-of-nucleons/)** | 15 | 14 | 27 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/117-understand-why-high-energies-are-required-to-investigate-the-structure-of-nucleons/) |
| **[118 be able to use the equation $\Delta E=c^{2}\Delta m$ in situations involving the creation and annihilation of matter and antimatter particles](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/118-be-able-to-use-the-equation-delta-e-c-2-delta-m-in-situations-involving-the/)** | 23 | 18 | 65 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/118-be-able-to-use-the-equation-delta-e-c-2-delta-m-in-situations-involving-the/) |
| **[119 be able to use MeV and GeV (energy) and MeV/$c^{2}$, GeV/$c^{2}$ (mass) and convert between these and SI units](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/119-be-able-to-use-mev-and-gev-energy-and-mev-c-2-gev-c-2-mass-and-convert-between/)** | 33 | 19 | 90 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/119-be-able-to-use-mev-and-gev-energy-and-mev-c-2-gev-c-2-mass-and-convert-between/) |
| **[120 understand situations in which the relativistic increase in particle lifetime is significant (use of relativistic equations not required)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/120-understand-situations-in-which-the-relativistic-increase-in-particle-lifetime-is/)** | 19 | 15 | 45 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/120-understand-situations-in-which-the-relativistic-increase-in-particle-lifetime-is/) |
| **[121 know that in the standard quark-lepton model particles can be classified as: • baryons (e.g. neutrons and protons), which are made from three quarks • mesons (e.g. pions), which are made from a quark and an antiquark • leptons (e.g. electrons and neutrinos), which are fundamental particles • photons and that the symmetry of the model predicted the top quark](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/121-know-that-in-the-standard-quark-lepton-model-particles-can-be-classified-as/)** | 34 | 20 | 63 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/121-know-that-in-the-standard-quark-lepton-model-particles-can-be-classified-as/) |
| **[122 know that every particle has a corresponding antiparticle and be able to use the properties of a particle to deduce the properties of its antiparticle and vice versa](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/122-know-that-every-particle-has-a-corresponding-antiparticle-and-be-able-to-use-the/)** | 10 | 7 | 20 | 2021–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/122-know-that-every-particle-has-a-corresponding-antiparticle-and-be-able-to-use-the/) |
| **[123 understand how to use laws of conservation of charge, baryon number and lepton number to determine whether a particle interaction is possible](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/123-understand-how-to-use-laws-of-conservation-of-charge-baryon-number-and-lepton/)** | 29 | 19 | 68 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/123-understand-how-to-use-laws-of-conservation-of-charge-baryon-number-and-lepton/) |
| **[124 be able to write and interpret particle equations given the relevant particle symbols.](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/124-be-able-to-write-and-interpret-particle-equations-given-the-relevant-particle/)** | 12 | 10 | 28 | 2020–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/124-be-able-to-write-and-interpret-particle-equations-given-the-relevant-particle/) |

## Browse every topic question

- [111 understand what is meant by nucleon number (mass number) and proton number (atomic number)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/111-understand-what-is-meant-by-nucleon-number-mass-number-and-proton-number-atomic/) — 14 question items · 14 papers — 17 marks · 2020–2026
- [112 understand how large-angle alpha particle scattering gives evidence for a nuclear model of the atom and how our understanding of atomic structure has changed over time](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/112-understand-how-large-angle-alpha-particle-scattering-gives-evidence-for-a-nuclear/) — 29 question items · 20 papers — 76 marks · 2020–2026
- [113 understand that electrons are released in the process of thermionic emission and how they can be accelerated by electric and magnetic fields](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/113-understand-that-electrons-are-released-in-the-process-of-thermionic-emission-and/) — 27 question items · 17 papers — 65 marks · 2020–2026
- [114 understand the role of electric and magnetic fields in particle accelerators (linac and cyclotron) and detectors (general principles of ionisation and deflection only)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/114-understand-the-role-of-electric-and-magnetic-fields-in-particle-accelerators/) — 37 question items · 19 papers — 100 marks · 2020–2026
- [115 be able to derive and use the equation $r=\frac{p}{BQ}$ for a charged particle in a magnetic field](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/115-be-able-to-derive-and-use-the-equation-r-frac-p-bq-for-a-charged-particle-in-a/) — 31 question items · 19 papers — 91 marks · 2020–2026
- [116 be able to apply conservation of charge, energy and momentum to interactions between particles and interpret particle tracks](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/116-be-able-to-apply-conservation-of-charge-energy-and-momentum-to-interactions/) — 27 question items · 15 papers — 89 marks · 2020–2026
- [117 understand why high energies are required to investigate the structure of nucleons](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/117-understand-why-high-energies-are-required-to-investigate-the-structure-of-nucleons/) — 15 question items · 14 papers — 27 marks · 2020–2026
- [118 be able to use the equation $\Delta E=c^{2}\Delta m$ in situations involving the creation and annihilation of matter and antimatter particles](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/118-be-able-to-use-the-equation-delta-e-c-2-delta-m-in-situations-involving-the/) — 23 question items · 18 papers — 65 marks · 2020–2026
- [119 be able to use MeV and GeV (energy) and MeV/$c^{2}$, GeV/$c^{2}$ (mass) and convert between these and SI units](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/119-be-able-to-use-mev-and-gev-energy-and-mev-c-2-gev-c-2-mass-and-convert-between/) — 33 question items · 19 papers — 90 marks · 2020–2026
- [120 understand situations in which the relativistic increase in particle lifetime is significant (use of relativistic equations not required)](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/120-understand-situations-in-which-the-relativistic-increase-in-particle-lifetime-is/) — 19 question items · 15 papers — 45 marks · 2020–2026
- [121 know that in the standard quark-lepton model particles can be classified as: • baryons (e.g. neutrons and protons), which are made from three quarks • mesons (e.g. pions), which are made from a quark and an antiquark • leptons (e.g. electrons and neutrinos), which are fundamental particles • photons and that the symmetry of the model predicted the top quark](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/121-know-that-in-the-standard-quark-lepton-model-particles-can-be-classified-as/) — 34 question items · 20 papers — 63 marks · 2020–2026
- [122 know that every particle has a corresponding antiparticle and be able to use the properties of a particle to deduce the properties of its antiparticle and vice versa](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/122-know-that-every-particle-has-a-corresponding-antiparticle-and-be-able-to-use-the/) — 10 question items · 7 papers — 20 marks · 2021–2026
- [123 understand how to use laws of conservation of charge, baryon number and lepton number to determine whether a particle interaction is possible](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/123-understand-how-to-use-laws-of-conservation-of-charge-baryon-number-and-lepton/) — 29 question items · 19 papers — 68 marks · 2020–2026
- [124 be able to write and interpret particle equations given the relevant particle symbols.](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/124-be-able-to-write-and-interpret-particle-equations-given-the-relevant-particle/) — 12 question items · 10 papers — 28 marks · 2020–2026

## Other topics in WPH14

- [Electric and Magnetic Fields 304 question items](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/electric-and-magnetic-fields/)
- [Further Mechanics 174 question items](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/further-mechanics/)

## Topic question rules and edge cases

**How many subtopics does Nuclear and Particle Physics contain?**

This page lists 14 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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Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-4-wph14/nuclear-and-particle-physics/