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15 ore fa · Richard Phillips Feynman (/ ˈ f aɪ n m ə n /; May 11, 1918 – February 15, 1988) was an American theoretical physicist, known for his work in the path integral formulation of quantum mechanics, the theory of quantum electrodynamics, the physics of the superfluidity of supercooled liquid helium, as well as his work in particle physics for which he proposed the parton model.
15 ore fa · Metaphysics is the branch of philosophy that examines the basic structure of reality. It is often characterized as first philosophy, implying that it is more fundamental than other forms of philosophical inquiry. Metaphysics is traditionally is not seen as the study of mind-independent features of the world, but some modern theorists understand ...
15 ore fa · In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak ...
15 ore fa · 1923 - Roscoe Dickinson and Albert Raymond, and independently, H.J. Gonell and Hermann Mark, first showed that an organic molecule, specifically hexamethylenetetramine, could be characterized by x-ray crystallography. [64] [65] 1923 - William H. Bragg and Reginald E. Gibbs elucidated the structure of quartz.
15 ore fa · In the 1930s, the university was a major center for theoretical physics. The cosmologist George Gamow produced critical work on the Big Bang theory at GW in the 1930s and 1940s. In one of the most important moments in the 20th century, Niels Bohr announced that Otto Hahn had successfully split the atom on January 26, 1939, at the Fifth Washington Conference on theoretical physics in the Hall ...
15 ore fa · Lawrencium is a synthetic chemical element; it has symbol Lr (formerly Lw) and atomic number 103. It is named in honor of Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements. A radioactive metal, lawrencium is the eleventh transuranic element and the last member of the actinide series.
22 mag 2024 · The solar model that was constructed out of these studies indicated that the solar neutrino problem discussed in Chap. 9 is actually a problem related to particle physics. Efforts to observe solar-like, i.e. p-mode vibrations in other stars succeeded for the first time in 1991 when the sub-giant Procyon was found to pulsate with a mean frequency 0.9 mHz and rms amplitude 2.5 ms \(^{-1}\) [ 7 ].
