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January 2011 - Maths Genie
January 2011 - Maths Genie

... Full marks may be obtained for answers to ALL questions. There are 7 questions in this question paper. The total mark for this paper is 75. Advice to Candidates You must ensure that your answers to parts of questions are clearly labelled. You must show sufficient working to make your methods clear t ...
Aspen-Winter08-summary
Aspen-Winter08-summary

Copyright © 2014 Edmentum - All rights reserved. AP Physics
Copyright © 2014 Edmentum - All rights reserved. AP Physics

... 8. You find the mass of an atom of sodium-23 listed as 22.989770 in a table. What are the units for this measurement? A. atomic mass units B. electron volts C. milligrams D. nanograms (10-9 g) E. grams ...
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Physical Origin of Elementary Particle Masses

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The characterization of ground states

The evolution of Pauli`s exclusion principle
The evolution of Pauli`s exclusion principle

... Tomonaga, 1997, pp. 63–77). The spectral frequencies produced by the two electrons would be influenced in different ways if the spatial dependence of the proton–proton state function was symmetric or antisymmetric under proton interchange. On the other hand, the ratios of the intensities of the spect ...
SG2 Atoms and Atomic Structure
SG2 Atoms and Atomic Structure

... A student who completes this unit should be able to do all of the following: 1) Explain three fundamental laws: a) Law of conservation of mass b) Law of definite proportions (for compounds) c) Law of multiple proportions (for different compounds of the same two elements) 2) Explain the history and d ...
The Quark & Bag Models
The Quark & Bag Models

... – Different colors attract, but not as strongly as a color and its opposite colors of quark and antiquark • The color force between color-neutral hadrons (like a proton and a neutron) is negligible at large separations – The strong color force between the constituent quarks does not exactly cancel a ...
Exam questions - Grand Valley State University
Exam questions - Grand Valley State University

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... The velocity  may be obtained from a time-of-flight measurement, since it is proportional to 1/ The energy loss E of a charged particle may be described by the Bethe-Block formula, where dE/dx is proportional to z2 All these informations may be combined to identify low energy particles ...
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The standard model of particle physics

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פרויקט ביולוגיה חישובית

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A. What Is an Atom?

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Quantum mechanics is the theory that we use to describe the

... fundamental differences between relativity and quantum mechanics, which will be elaborated on in later pages. One fundamental difference is that general relativity says that spacetime is warped due to the presence of masses, and the force of gravity is not the result of any particle, but due to the ...
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... If the time constant for bonding is longer or the bonds are weak, higher dimension, reaction controlled aggregates appear. The mass fractal dimension of such aggregates is typically 2.5. In carbon black synthesis 3-d, solid nano-aggregates sometimes form. Also, rigid aggregates on the order of 0.1 m ...
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The relation between the ( hypothetical) intrinsic vibrational motion

... The set of results indicates the following. If the intrinsic vibration-rotation motion of fundamental particles exists in nature, such motion must trap quantized amounts of magnetic flux, which is required by gauge invariance of the theory. The values of the flux depend on the actual charge of the p ...
theoretical physics in crisis
theoretical physics in crisis

LC Atomic Structure [PDF Document]
LC Atomic Structure [PDF Document]

The “classically forbidden regions” are where … a. a particle`s total
The “classically forbidden regions” are where … a. a particle`s total

Professor Liss
Professor Liss

< 1 ... 377 378 379 380 381 382 383 384 385 ... 447 >

Elementary particle



In particle physics, an elementary particle or fundamental particle is a particle whose substructure is unknown, thus it is unknown whether it is composed of other particles. Known elementary particles include the fundamental fermions (quarks, leptons, antiquarks, and antileptons), which generally are ""matter particles"" and ""antimatter particles"", as well as the fundamental bosons (gauge bosons and Higgs boson), which generally are ""force particles"" that mediate interactions among fermions. A particle containing two or more elementary particles is a composite particle.Everyday matter is composed of atoms, once presumed to be matter's elementary particles—atom meaning ""indivisible"" in Greek—although the atom's existence remained controversial until about 1910, as some leading physicists regarded molecules as mathematical illusions, and matter as ultimately composed of energy. Soon, subatomic constituents of the atom were identified. As the 1930s opened, the electron and the proton had been observed, along with the photon, the particle of electromagnetic radiation. At that time, the recent advent of quantum mechanics was radically altering the conception of particles, as a single particle could seemingly span a field as would a wave, a paradox still eluding satisfactory explanation.Via quantum theory, protons and neutrons were found to contain quarks—up quarks and down quarks—now considered elementary particles. And within a molecule, the electron's three degrees of freedom (charge, spin, orbital) can separate via wavefunction into three quasiparticles (holon, spinon, orbiton). Yet a free electron—which, not orbiting an atomic nucleus, lacks orbital motion—appears unsplittable and remains regarded as an elementary particle.Around 1980, an elementary particle's status as indeed elementary—an ultimate constituent of substance—was mostly discarded for a more practical outlook, embodied in particle physics' Standard Model, science's most experimentally successful theory. Many elaborations upon and theories beyond the Standard Model, including the extremely popular supersymmetry, double the number of elementary particles by hypothesizing that each known particle associates with a ""shadow"" partner far more massive, although all such superpartners remain undiscovered. Meanwhile, an elementary boson mediating gravitation—the graviton—remains hypothetical.
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