Edexcel International A Level Physics
Edexcel International A Level Physics Nuclear and Particle Physics Exam Questions
Free Edexcel International A Level Physics exam questions for 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, quarks, leptons and conservation laws.
Nuclear and Particle Physics exam questions
1 question pack 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 International A Level Physics Nuclear and Particle Physics
Nuclear and particle physics is part of Unit 4: Further Mechanics, Fields and Particles in Edexcel International A Level Physics. It begins with alpha particle scattering and the nuclear model of the atom, then explains how linear accelerators and cyclotrons accelerate charged particles and how detectors identify them from their tracks in magnetic fields. You use ΔE = c^2Δm and MeV/c^2 units, classify particles in the standard model and apply conservation laws. The topic draws on Further mechanics and Electric and magnetic fields in the same unit. Examiners often ask you to interpret curved tracks and check whether an interaction is possible.
What you need to know
- Nuclear model Alpha particle scattering showed a small, dense, positive nucleus. High-energy electrons are also used to probe nuclear structure because their de Broglie wavelength is small.
- Accelerators Linear accelerators use alternating p.d.s across drift tubes of increasing length. Cyclotrons use a perpendicular magnetic field and an alternating p.d. across the gap between two dees.
- Detectors In a magnetic field the radius of a charged particle's path is r = p/BQ. Direction of curvature shows the sign of the charge; neutral particles leave no tracks.
- Mass and energy ΔE = c^2Δm. Energy can create particle-antiparticle pairs and annihilation produces photons. Masses are quoted in MeV/c^2 or GeV/c^2.
- Standard model Six quarks and six leptons, each with an antiparticle. Baryons are three quarks, mesons are a quark and an antiquark. Charge, baryon number and lepton number are conserved.
Common mistakes in Nuclear and Particle Physics
- Thinking a more tightly curved track means a faster particle. Smaller radius means lower momentum.
- Saying cyclotron particles speed up because of the magnetic field. The magnetic field only changes direction; the electric field across the gap accelerates them.
- Giving antiquarks the same charge as quarks.
- Forgetting lepton number conservation in interactions involving electrons and neutrinos.
- Confusing MeV (energy) with MeV/c^2 (mass).
Try three Nuclear and Particle Physics exam-style questions
1. A proton and an antiproton, each with rest mass 938 MeV/c^2, annihilate at rest producing two photons. Calculate the energy of each photon in joules. (2 marks)
Show the mark scheme answer
Each photon energy = 938 MeV; = 938 × 10^6 × 1.60 × 10^-19 = 1.5 × 10^-10 J.
2. A K+ meson has quark composition u s-bar. Show that its charge is +1e and state its baryon number. (2 marks)
Show the mark scheme answer
Charge = +2/3 + 1/3 = +1e; baryon number = 1/3 - 1/3 = 0.
3. Explain how the curvature of a track in a magnetic field gives information about a charged particle. (3 marks)
Show the mark scheme answer
Force Bqv acts perpendicular to velocity so the path is circular; radius r = p/BQ so a larger radius means larger momentum (for the same charge); the direction of curvature shows whether the charge is positive or negative.
Nuclear and Particle Physics FAQs
What does Edexcel International A Level Physics 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 in particle interactions.
Which unit is Nuclear and particle physics examined in?
It is examined in Unit 4: Further Mechanics, Fields and Particles.
What should I memorise for Nuclear and particle physics?
Learn the charges of the quarks, the quark make-up of protons and neutrons, how to apply conservation of charge, baryon number and lepton number, and r = p/BQ for particle tracks.
