State the four fundamental interactions of nature.
A positive muon (μ+\mu^+μ+) is an unstable particle. State the products of the decay of a free positive muon.
Explain which of the fundamental interactions is responsible for the decay of the positive muon.
The electromagnetic interaction between an approaching electron and a proton causes them to attract and change their directions of motion. Explain, using the concept of exchange particles, how this interaction results in a change in their paths.
50 exam-style questions on AQA A Level Physics Particles, covering Constituents of the atom, Stable and unstable nuclei, Particles, antiparticles and photons, Particle interactions, Classification of particles, Quarks and antiquarks, and Applications of conservation laws. Each one has a worked solution and a mark scheme showing where the marks go.