Year 13 Physics
Particle physics
Particle accelerators and detectors, hadrons, leptons and quarks, antimatter, conservation laws in particle interactions, and the fundamental forces and exchange particles.
Particle physics free practice
No timer and no account needed. Check each answer as you go, then read the explanation.
1. A helium-4 nucleus contains 2 protons and 2 neutrons. How many down quarks does it contain?
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