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# What are leptons?

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A lepton is a building block of matter. Several leptons exists, including electrons, muons, tau particles and neutrinos. Leptons differ in characteristics with neutrinos being the most exotic.

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The electron is considered a fundamental particle. It follows Pauli's Exclusion principle, meaning it cannot have the same quantum number or have the same energy state as another electron. Its antiparticle is the positron, which carries an opposite charge. The muon decays to form either an electron or positron. The tau is the largest of leptons and has a mass that is 3490 times more at rest than the electron and 17 times more than a muon.

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## Related Questions

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Particle theory, also referred to as the kinetic theory of matter, is a theory in science that describes all forms of matter as being composed of tiny particles that are always in a constant state of motion. The theory also states that the degree to which these particles move around depends on the amount of energy that is present in the matter and what the nature of the relationship is between the various particles.

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One example of E=m*c^2 is the equation that demonstrates the conversion of 1 kg of matter into 9.0*(10^16) J of energy. Examples of E=m*c^2, or the mass-energy equivalence equation, can be found in physics classrooms in equations that convert matter to energy and vice versa. The formula is based on the theory that matter is directly proportional to energy.

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According to Emc2-explained, the equation E=mc^2 describes the conversion between matter and energy. This is a constant relationship, and it applies to the conversions observed in atomic fission and nuclear fusion as well as the release of energy obtained from matter or antimatter reactions. In each case, E=mc^2 is a way of predicting energy release. The equation also predicts the amount of energy required to synthesize matter from energy.