A slot car (sometimes, slotcar) is a powered miniature auto or other vehicle that is guided by a groove or slot in the track on which it runs.
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Muon. The muon is a lepton which decays to form an electron or positron. The fact that the above decay is a three-particle decay is an example of the conservation of lepton number; there must be one electron neutrino and one muon neutrino or antineutrino in the decay.The lifetime of the muon is 2.20 microseconds.eptons and quarks are the basic building blocks of matter, i.e., they are seen as the elementary particles. There are six leptons in the present structure, the electron, muon, and tau particles and their associated neutrinos.