BRAINCAKEQuarks and Antiquarks
Quarks are fundamental particles that make up hadrons. At A level, OCR uses three types (flavours) of quark: up (u), down (d) and strange (s). Three heavier flavours (charm, top and bottom) also exist but are not needed here.
Quarks have fractional charges, measured in units of the elementary charge e (1.60 × 10−19 C):
up u: +2⁄3e down d: −1⁄3e strange s: −1⁄3e
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Key terms in this lesson
- hadron
- A particle made of quarks that is affected by the strong nuclear force, such as a proton or neutron.
More in Fundamental Particles
- Fundamental Particles
- Antiparticles
- Hadrons and Leptons
- The Strong Nuclear Force
- Quark Composition of Protons and Neutrons
- Baryons and Mesons
- Beta-Minus Decay and Quarks
- Beta-Plus Decay and Quarks
All 11 lessons in Fundamental Particles · All OCR A-level Physics topics