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Edexcel IGCSE Physics topic guide

Radioactivity and particles questions

Balance nuclear equations, interpret half-life graphs, and explain the uses, risks and energy changes of nuclear processes.

Edexcel IGCSE Physics Topic 7

Radioactivity and particles topic overview

Radioactivity and particles covers atomic nuclei, ionising radiation, half-life, nuclear equations, radiation safety, fission and fusion.

Track nucleon number and charge separately, read half-life graphs from consistent intervals, and balance benefits against risk when evaluating radiation uses.

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Question types in radioactivity and particles

  1. Nuclear structure, isotope notation and balanced decay equations.
  2. Comparisons of alpha, beta and gamma radiation, including penetration and ionisation.
  3. Half-life calculations and activity graph interpretation.
  4. Explanations of radiation uses, contamination, irradiation, fission and fusion.

Radioactivity and particles subtopics

Choose a subtopic for its syllabus points, answering guidance and worked exam questions.

7.a Units Activity in becquerels and consistent time units for decay calculations. 7.b Radioactivity Nuclear structure, radiation types, half-life, decay equations and radiation safety. 7.c Fission and fusion Splitting and joining nuclei, chain reactions, nuclear reactors and energy release.