homework Ch5.docx - CH 5 1-4,6,7,11,12 B14 1 Elementary particles can be grouped into two classes\u2019 leptons(electrons and neutrinos and the much

homework Ch5.docx - CH 5 1-4,6,7,11,12 B14 1 Elementary...

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CH 5; 1-4,6,7,11,12 B14 1. Elementary particles can be grouped into two classes’ leptons (electrons and neutrinos) and the much heavier hadrons, for example protons, neutrons, and pi mesons. Only the hadrons experience strong forces. Among elementary particle classes, leptons differ from more massive particles like protons and neutrons because leptons do not feel strong forces . Particles that experience strong forces are called Hadrons . Hadrons are perhaps the most important, and as yet mysterious of the elementary particles. In general, hadrons are much more massive than leptons. The functions of hadrons and their antiparticles are also twofold. First the best-known hadrons, protons, and neutrons form the nuclei of atoms and hence compromise most of what we call cell matter. Secondly, the hadrons themselves produce the strong forces that bind the nuclei of atoms. They’re may be an infinite number of hadrons with greater masses, we just haven’t got all of them together yet. 2. The collision of a positron and an electron is either a scattering event or a mutual annihilation event. Remember that the positron is antimatter; it's the antiparticle of the electron. It has a positive charge and will be attracted to electrons (or anything else negative). If a positron has extremely high energy, it will have to
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