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24.0Nuclear and Particle Physics

Overview: Nuclear and Particle Physics: The Nucleus, Decay, Reactions and the Building Blocks of Matter — American System Physics Revision Notes & Topical Questions

5 min read 7 parts Lesson 2 of 5 Unit quiz

📚 American System Physics Hub / Topical Revision
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Lesson summary

Describe nuclear structure and binding energy.Iron-56 has the highest binding energy per nucleon.Beta decay involves a down quark changing to an up quark.Particle accelerators and detectors study subatomic particles.Matter and antimatter annihilate into energy.The four fundamenta…

  • The four fundamental forces
  • A 64 g sample has a half-life of 2 days. Mass left after 6 days?
  • Complete: 23892U → 23490Th + ?
  • Strong nuclear force
  • Radioactive decay
  • Antiparticle

Section 1 of 7Overview: Nuclear and Particle Physics: The Nucleus, Decay, Reactions and the Building Blocks of Matter

1
24.1 Nuclear and Particle Physics: The Nu… concept map: The four fundamental forces, A 64 g sample has a half-life, Complete: 23892U → 23490Th + ?, Nucleon, Strong nuclear force
Visual guide to the key ideas explained in this lesson.
2
1 u of mass is equivalent to 931.5 MeV.
3
Nuclear power plants use controlled fission.
4
Stars produce energy by fusion.
5
Neutrinos rarely interact with matter.
6
Radiation dose is measured in sieverts.

Section 2 of 7Process & sequence

1
Write the nuclear equation.
2
Balance mass numbers and atomic numbers.
3
Identify the product nucleus.
4
Use half-life: N = N0(½)t/T.
5
For energy, find mass defect and use E = mc².

Structure of matterwrite these steps in this order; each step is a marking point.

  1. Atom
  2. Nucleus
  3. Protons and neutrons
  4. Quarks
  5. Standard Model

Section 3 of 7Compare

Radiation types
TypeCompositionChargeStopped by
Alpha42He nucleus+2Paper
BetaElectron−1Aluminium
GammaPhoton0Thick lead
Standard Model
GroupMembers
Quarksup, down, charm, strange, top, bottom
Leptonselectron, muon, tau and their neutrinos
Force carriersphoton, gluon, W and Z bosons
Higgs bosonGives particles mass

Section 4 of 7Worked examples

1A 64 g sample has a half-life of 2 days. Mass left after 6 days?
  • 3 half-lives: 64 × ⅛ = 8 g.
2Complete
23892U → 23490Th + ?
  • 42He (alpha particle).

Section 5 of 7Key terms

Section 6 of 7Command terms

Command terms
Identify / Describe (FRQ)
A short, specific statement; describing requires relevant characteristics, not a single word.
Explain / Justify (FRQ)
Give the cause-and-effect reasoning or evidence; a restated fact does not score.
Calculate
Show setup, substitution and the answer with units.
Predict
State the expected outcome; add a reason only if asked to justify.
MCQ technique
Read every option; eliminate distractors that are true statements but do not answer the question; watch for NOT/EXCEPT.

Section 7 of 7Exam technique

Keywords the mark scheme looks for in this lesson

Keywords the mark scheme looks for in this lesson
Nucleon · Strong nuclear force · Binding energy · Radioactive decay · Half-life · Fission · Fusion · Quarks · Leptons · Antiparticle
Learn each definition in the Key words tab exactly; a missing keyword in a definition usually loses the mark.

How to get full marks (examiner guidance)

1
Answer exactly what is asked; extra correct material does not earn credit, and contradictory statements can cancel credit (AP FRQ).
2
Use precise vocabulary (e.g. “active site”, “concentration gradient”, “allele”), never “it/stuff/things”.
3
Show units and working in calculations.
4
In MCQs, predict the answer before reading the options, then eliminate.

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