com, quantum electrodynamics is the quantum field theory that describes the properties of electromagnetic radiation and its interaction with electrically charged matter in the framework of quantum theory. Now, to me, that is still complete jumble, so I will dissect and simplify. Quantum field theory is simply the .
study of the quantum mechanical interaction of elementary particles and fields. Elementary particles (electrons, protons, neutrons, quarks, etc.) are the most basic physical constituents of the universe, and fields are regions throughout which a force may be exerted. Electromagnetic radiation is the energy radiated in the form of a wave as a result of the motion of electric charges. Quantum theory is the modern physical theory concerned with the emission and absorption of energy by matter and with the motion of material particles. Therefore, QED is the theory that describes how the energy from the motion of electric charges interacts with electrically charged matter when dealing only with the interaction of elementary particles and fields. Okay, so it may not be simpler, but it is more comprehendible. .
QED deals with the creation of elementary particles from electromagnetic energy, and with the reverse processes in which a particle and its antiparticle annihilate each other and produce energy. QED was the first theory to resolve the difficulties of building a consistent, fully quantum description of fields and the creation and annihilation of quantum particles. Sin-Itiro Tomonaga, Julian Schwinger, and Richard Feynman received the 1965 Nobel Prize in Physics for its development, although each developed the theory in the late 1940s entirely independent of the other two. They each developed the theory by refining the discovery made by P.A.M. Dirac of an equation describing the motion and spin of electrons that incorporated both the quantum theory and the theory of special relativity (Einstein's, of course).
Einstein used Planck's quantum hypothesis to describe the electromagnetic radiation of light. ... His contribution helped unify important parts of the classical mechanics and Maxwell's electrodynamics. ... After 1905 Einstein made more important contributions to the quantum theory, but his intent was to extend the Special Theory of Relativity involving acceleration. ...
The results of an electrodynamic investigation recently published by me in this journal lead to a very interesting conclusion, which will be derived here.... Having discovered both special and general theories of relativity, Einstein started working on a new theory--a unified field theory which, apart from gravitation, was also to include electrodynamics. Einstein could not accept quantum mechanics as a completed theory, for its mathematics did not describe individual events. ... He got a lot of support and attention during the first decade of his ...
The energy associated with these quantum jumps explained the lines seen in the spectra of different elements. ... In the 1920s, this model was succeeded by a fully quantum-mechanical model, which Niels also helped to create. ... He provided so much of the stimulus for the development of ideas in quantum mechanics that the standard interpretation of quantum mechanics, which was developed by Bohr and others in the 1920s, became known as the "Copenhagen interpretation." ... Contrary to electrodynamic theory, the electrons did not emit electromagnetic radiation. ... This was used to describe...
"Einstein's theories are credited as the starting point of nuclear physics, modern cosmology and quantum mechanics- (Freeman 3). ... These papers started the nuclear age, cosmology and quantum mechanics, and brought him world wide recognition. ... His second Theory was The Quantum Law of the Emission and Absorption of Light where energy could exist in form of little packets or quantas (Candee 179). ... The final paper was a brief titled On the Electrodynamics of Moving Bodies. ...
Black Holes Every day we look out upon the night sky, wondering and dreaming of what lies beyond our planet. The universe that we live in is so diverse and unique, and it interests us to learn about all the variance that lies beyond our grasp. Within this marvel of wonders, our universe ho...
Black Holes Every day we look out upon the night sky, wondering and dreaming of what lies beyond our planet. The universe that we live in is so diverse and unique, and it interests us to learn about all the variance that lies beyond our grasp. Within this marvel of wonders, our universe h...
Black Holes Every day we look out upon the night sky, wondering and dreaming of what lies beyond our planet. The universe that we live in is so diverse and unique, and it interests us to learn about all the variance that lies beyond our grasp. Within this marvel of wonders, our universe holds ...
The brilliant staff also included the Nobel-Prize winner Enrico Fermi, who started work on the nuclear reactor; Richard Feynman, the practical joker of the project, who would later win the Nobel-Prize in 1965 for his work in quantum electrodynamics(Cohen 45); Op...