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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The muon (/ËmjuËÉn/ ; from the Greek letter mu (Î¼) used to represent it) is an elementary particle similar to the electron, with electric charge of â1 e and a spin of 1â2, but with a much greater mass (7002105700000000000â 105.7 MeV/c2).he muon orbits much closer to the nucleus, so muonic helium can therefore be regarded like an isotope of helium whose nucleus consists of two neutrons, two protons and a muon, with a single electron outside. Colloquially, it could be called helium 4.1, since the mass of the muon is roughly 0.1 amu.