What is the primary subject of quantum chromodynamics?
Quarks and gluons
Electrons and photons
Neutrons and protons
Atoms and molecules
Answer
Quarks and gluons are the primary subjects of quantum chromodynamics (QCD), a branch of particle physics. QCD describes the strong nuclear force that binds quarks together to form protons and neutrons, the building blocks of atomic nuclei. Quarks are elementary particles with fractional electric charges, while gluons are force-carrying particles that mediate the strong force between quarks.
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