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complex number
complex number

... APPLICATION OF COMPLEX NUMBER:1. IN ELECTRICAL ENGINEERING:Complex numbers are used a great deal in electronics. The main reason for this is they make the whole topic of analyzing and understanding alternating signals much easier. This seems odd at first, as the concept of using a mix of real and 'i ...
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... In the second case, the laser beam enters the scattering region in a direction such that its polarization direction ˆ bisects the angle between the incident direction and outgoing direction of the electron. The low-frequency KWA formula has a simple form. The cross section for absorbing n photons i ...
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... 1) Review spin, orbital and total angular momentum Many symmetries that we observe in nature are associated with conservation laws. Often these kinds of symmetries are categorized by group theory. Spin conservation comes from the symmetry between spin up and spin down particles. An interaction with ...
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... larger than the two-loop corrections. Thus, two-loop computations do actually not improve evidence for unification. Similarly, the uncertainty in the value of the coefficient c is far greater than experimental uncertainties in measurements of SM/MSSM parameters. For example, the parameter range 3 ð ...
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... The Euclidean approach to quantum field theory on a curved background has advantages since elliptic operators are easier to deal with than hyperbolic operators. To obtain physically meaningful results one must presumably perform the analytic continuation back to real time. In general, Lorentzian spa ...
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Quantum electrodynamics



In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved. QED mathematically describes all phenomena involving electrically charged particles interacting by means of exchange of photons and represents the quantum counterpart of classical electromagnetism giving a complete account of matter and light interaction.In technical terms, QED can be described as a perturbation theory of the electromagnetic quantum vacuum. Richard Feynman called it ""the jewel of physics"" for its extremely accurate predictions of quantities like the anomalous magnetic moment of the electron and the Lamb shift of the energy levels of hydrogen.
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