Edexcel A Level Physics
Edexcel A Level Physics Topic 8: Nuclear and Particle Physics Exam Questions
Free Edexcel A Level Physics exam questions for Topic 8: Nuclear and Particle Physics, with a mark scheme for every pack. Covers alpha particle scattering, nuclear structure, linear accelerators, cyclotrons, particle detectors, mass-energy equivalence and the standard model.
Topic 8: Nuclear and Particle Physics exam questions
2 question packs of real past exam questions, each with its mark scheme. Do not stop after a few: answer as many as you can without notes, then mark every answer with the mark scheme. The more questions you do, the more quickly you will spot how examiners ask about each idea.
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About Edexcel A Level Physics Topic 8: Nuclear and Particle Physics
Topic 8: Nuclear and Particle Physics in Edexcel A Level Physics covers nuclear structure and particle accelerators, then particle physics and the standard model. You interpret alpha particle scattering, explain how linear accelerators and cyclotrons accelerate charged particles, and analyse particle tracks in detectors using magnetic fields. You also use E = c^2Δm, units of MeV/c^2, and classify particles as quarks, leptons, baryons and mesons, applying conservation laws to particle interactions. It is assessed in Paper 1: Advanced Physics I and relies heavily on Topics 6 and 7.
What you need to know
- Nuclear structure Large-angle alpha particle scattering showed a small, dense, positively charged nucleus. Nuclides are written with nucleon number A and proton number Z.
- Particle accelerators A linear accelerator uses alternating p.d.s across drift tubes that get longer as particles speed up. A cyclotron uses a magnetic field to bend particles in a spiral and an alternating p.d. across the gap between the dees.
- Detectors Charged particles leave tracks; in a magnetic field r = p/BQ, so curvature reveals charge sign and momentum. Neutral particles leave no tracks.
- Mass and energy ΔE = c^2Δm. Particle masses are quoted in MeV/c^2 or GeV/c^2. In pair production and annihilation, energy and momentum are conserved.
- Standard model Six quarks (up, down, strange, charm, top, bottom) and six leptons, each with an antiparticle. Baryons contain three quarks; mesons contain a quark and an antiquark.
- Conservation laws In interactions, charge, baryon number and lepton number are conserved. Use these to decide whether a reaction is possible.
Common mistakes in Topic 8: Nuclear and Particle Physics
- Saying drift tubes in a linac get longer because particles slow down. They get longer because particles speed up but the a.c. frequency is fixed.
- Forgetting that a tighter curve in a detector means lower momentum, not higher.
- Forgetting antiquarks have opposite charge and baryon number -1/3.
- Ignoring lepton number when checking whether an interaction is allowed.
- Mixing MeV and MeV/c^2. MeV is energy; MeV/c^2 is mass.
Try three Topic 8: Nuclear and Particle Physics exam-style questions
1. A proton moving at 1.0 × 10^7 m s^-1 enters a uniform magnetic field of 0.50 T at right angles. Calculate the radius of its path. (3 marks)
Show the mark scheme answer
p = mv = 1.67 × 10^-27 × 1.0 × 10^7 = 1.67 × 10^-20 kg m s^-1; r = p/BQ = 1.67 × 10^-20/(0.50 × 1.60 × 10^-19); r = 0.21 m.
2. Explain why the drift tubes in a linear accelerator increase in length along the accelerator. (2 marks)
Show the mark scheme answer
The particles gain speed after each gap; the alternating p.d. has a fixed frequency so each tube must be longer so that the particle spends the same time (half a cycle) inside each tube.
3. Show that the reaction p + p → p + n + π+ conserves charge and baryon number. (2 marks)
Show the mark scheme answer
Charge: +1 + 1 = +1 + 0 + 1; baryon number: 1 + 1 = 1 + 1 + 0.
Topic 8: Nuclear and Particle Physics FAQs
What does Edexcel A Level Physics Topic 8: Nuclear and Particle Physics cover?
It covers alpha particle scattering, nuclear structure, linear accelerators, cyclotrons, particle detectors, mass-energy equivalence, the standard model and conservation laws.
Which paper is Topic 8 examined in?
It is assessed in Paper 1: Advanced Physics I, and like every topic it can also appear in Paper 3: General and Practical Principles in Physics.
What should I learn about quarks for this topic?
Learn the six quarks and their charges, the quark make-up of the proton (uud) and neutron (udd), and how to apply conservation of charge, baryon number and lepton number.
