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quark_1 - PHY2061 R D Field The Simple Structure of our...

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PHY2061 R. D. Field Department of Physics quark_1.doc University of Florida The Simple Structure of our Universe Elementary Particle: Indivisible piece of matter without internal structure and without detectable size or shape . . Four Forces: Gravity ( Solar Systems, Galaxies, Curved Space-Time , Black Holes ) Electromagnetism ( Atoms & Molecules, Chemical Reactions ) Weak ( Neutron Decay, Beta Radioactivity ) Strong ( Atomic Nuclei, Fission & Fusion ) Two Classes of Elementary Particles: Leptons: Do not interact with the strong force (but may interact with weak, EM and gravity). Quarks: Do interact with the strong force (may also
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