What does the Space and radioactivity module cover?

This module gathers the space and nuclear content of Physics 2 in WJEC GCSE Science Double Award. It covers the structure of the Solar System and how gravity keeps things in orbit, how stars form and stay stable, radioactive decay and the alpha, beta and gamma types of radiation, half-life and its uses, and nuclear fission, the chain reaction and nuclear fusion in stars.

Which unit and paper assess this module?

These topics are part of Unit 6 (Physics 2), a written paper of 1 hour 15 minutes worth 15 percent of the Double Award qualification, sat at Foundation or Higher tier. Questions mix recall, half-life calculations and explanation.

What skills are needed here?

You need to do half-life calculations (halving the activity for each half-life) and read a decay graph, compare the penetrating powers of alpha, beta and gamma, and explain orbits, star stability, fission and fusion. Subtracting background radiation is a common practical point.

What kinds of question come up?

Expect questions on the Solar System and gravity, how a star forms and stays stable, the three types of radiation and their penetrating power and uses, half-life calculations and uses, the dangers and safety of radiation, and nuclear fission, the chain reaction and fusion.

How should I revise this module?

Learn the Solar System and the role of gravity, and how stars form and stay stable. Learn the three radiation types with their penetration and uses, and practise half-life calculations and reading decay graphs. Understand fission, the chain reaction and fusion, and the pros and cons of nuclear power. Use WJEC Double Award past papers and watch the command words.

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WJEC GCSE Science Double Award: Space and radioactivity (Unit 6, Physics 2) overview

An overview of the Space and radioactivity module in WJEC GCSE Science Double Award (Unit 6, Physics 2), mapping the Solar System and stars, types of radiation, half-life, and nuclear fission and fusion.

Generated by Claude Opus 4.86 min readDouble Award Unit 6 (Physics 2)Updated 2026-06-15

Reviewed by: AI editorial process; not yet individually human-reviewed

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The topics in this module
How this module fits the exam
How to study this module

The Space and radioactivity module gathers the space and nuclear content of Physics 2 in WJEC GCSE Science Double Award. It covers the Solar System and stars, and the radiation and nuclear processes that power them. This page maps the module and links to a focused answer page for each part.

The topics in this module

The Solar System and stars: The Solar System, gravity and orbits, and how stars form and stay stable. See The Solar System and stars.
Types of radiation: Radioactive decay and the alpha, beta and gamma types with their uses and dangers. See Types of radiation.
Half-life: Half-life, calculating the remaining activity, and uses such as dating and medicine. See Half-life.
Nuclear fission and fusion: Fission and the chain reaction, and fusion in stars. See Nuclear fission and fusion.

How this module fits the exam

These topics sit in Unit 6 (Physics 2), a written paper of 1 hour 15 minutes worth 15%. Questions mix recall (radiation types, the Solar System), half-life calculations, and explanation (orbits, fission and fusion).

How to study this module

Learn the Solar System and gravity. Orbits, and how stars form and stay stable.
Know the radiation types. Alpha, beta and gamma penetration, dangers and uses.
Master half-life. Halving for each half-life, and reading a decay graph.
Understand fission and fusion. The chain reaction, and fusion in stars.
Weigh up nuclear power. Its advantages and disadvantages, and waste.

Then test yourself with the module quiz.

Sources & how we know this

WJEC GCSE Science (Double Award) specification (from 2016) — WJEC (2016)