1280_Physics ProblemsTechnical Physics

1280_Physics ProblemsTechnical Physics - Chapter 46 Q46.18...

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Chapter 46 621 Q46.18 The Ξ particle has, from Table 46.2, charge – e , spin 1 2 , B = 1, LL L e === µτ 0, and strangeness –2. All of these are described by its quark composition dss (Table 46.5). The properties of the quarks from Table 46.3 let us add up charge: −−−= 1 3 1 3 1 3 eeee ; spin +−+= 1 2 1 2 1 2 1 2 , supposing one of the quarks is spin-down relative to the other two; baryon number 1 3 1 3 1 3 1 ++= ; lepton numbers, charm, bottomness, and topness zero; and strangeness 0 1 1 2 −−= . Q46.19 The electroweak theory of Glashow, Salam, and Weinberg predicted the W + , W , and Z particles. Their discovery in 1983 confirmed the electroweak theory. Q46.20 Hubble determined experimentally that all galaxies outside the Local Group are moving away from us, with speed directly proportional to the distance of the galaxy from us. Q46.21 Before that time, the Universe was too hot for the electrons to remain in any sort of stable orbit around protons. The thermal motion of both protons and electrons was too rapid for them to be in close enough proximity for the Coulomb force to dominate.
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