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Quantum Physics

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		WAVE PARTICLE DUALITY ^Votes:0 or ? W elcome to a series of pages on the natures of particles and waves and their similarities and differences in the field of modern physics. These pages are intended to aid the reader in the first year, second semester course Quantum Physics. You are supposed to follow the pages in rotation starting with chapter 1, completing the questions as you go. If you need to a break remember where you are either by adding a bookmark (goto menu Bookmarks, then Add Bookmark) or by remembering where you were and finding your place using the index option below. Your reply to questions is not being monitored, so don't feel under any pressure to get the correct answer the first time, but the system is here to help you learn so please use it. I would be grateful for any comments you have via e-mail. tom Read More Go to Site


		2. Some Basic Ideas about Quantum Mechanics ^Votes:0 2. Some Basic Ideas about Quantum Mechanics Modern physics is dominated by the concepts of Quantum Mechanics. This page aims to give a brief introduction to some of these ideas. Until the closing decades of the last century the physical world, as studied by experiment, could be explained according to the principles of classical (or Newtonian) mechanics: the physics of everyday life. By the turn of the century, however, the cracks were beginning to show and the disciplines of Relativity and Quantum Mechanics were developed to account for them. Relativity came first, and described the physics of very massive and very fast objects, then came Quantum Mechanics in the 1920's to describe the physics of very small objects. Neither of these theories provide an easy intuitive picture of the world, Read More Go to Site

		Heisenberg - Quantum Mechanics, 1925-1927: The Uncertainty Principle ^Votes:0 Heisenberg in 1927. The more precisely the position is determined, the less precisely the momentum is known in this instant, and vice versa. --Heisenberg, uncertainty paper, 1927 T his is a succinct statement of the "uncertainty relation" between the position and the momentum (mass times velocity) of a subatomic particle, such as an electron. This relation has profound implications for such fundamental notions as causality and the determination of the future behavior of an atomic particle. B ecause of the scientific and philosophical implications of the seemingly harmless sounding uncertainty relations, physicists speak of an uncertainty principle , which is often called more descriptively the "principle of indeterminacy." This page focuses on the origins of Heisenberg' Read More Go to Site

		Index of /cat ^Votes:0 Index of /cat Name Last modified Size Description Parent Directory - Apache Server at users.aber.ac.uk Port 80 Read More Go to Site

		NASA GISS: MOLSCAT v. 14 ^Votes:0 + NASA Portal + Goddard Space Flight Center + GSFC Earth Sciences Division MOLSCAT --> By Jeremy M. Hutson and Sheldon Green MOLSCAT is a code for quantum mechanical (coupled channel) solution of the nonreactive molecular scattering problem. Code is implemented for various types of collision partners. In addition to the essentially exact close coupling method several approximate methods, including the Coupled States and Infinite Order Sudden approximations, are provided. The code is in near standard FORTRAN 77 and has been ported to a large number of platforms. The source code supplied was run at this site on an IBM RS/6000 and also on IBM and compatible mainframes. It should work on most other machines; for the Cray, however, modifications to run in single precision should be made. MOLSCA Read More Go to Site

		New Page 1 ^Votes:0 This page uses frames, but your browser doesn't support them. Read More Go to Site

		Origins of Quantum Mechanics ^Votes:0 Origins of Quantum Mechanics The Hollow Chamber : The hollow chamber is a good approximation of a black body. It has a tiny aperture through which radiation is emitted, and is immersed in a heat bath to keep it at constant temperature. The radiation emitted can be detected and analyzed with a spectrometer in order to obtain the spectral distribution of the emitted radiation energy. Spectral Distribution of the black body: The spectrum of the black body radiation is plotted for three different temperatures, 2000 K, 1750 K, and 1250 K. They appear as differently coloured solid curves with the radiation energy plotted as energy density per wavelength unit over wavelength (measured in nm). Stefan-Boltzmann's Law of black body radiation: The total emitted radiation energy of the black body at a Read More Go to Site

		Particles, Special Relativity and Quantum Mechanics ^Votes:0 Particles, Special Relativity and Quantum Mechanics Special Relativistic Paradoxes and Puzzles Tachyons The Particle Zoo Does Antimatter Fall Up or Down? What is the Mass of a Photon? Baryogenesis - Why Are There More Protons Than Antiprotons? The EPR Paradox and Bell's Inequality Principle Some Frequently Asked Questions About Virtual Particles Main Physics Contents page Special Relativistic Paradoxes The Barn and the Pole The Twin Paradox The Superluminal Scissors Relativity and Quantum Mechanics Contents The Barn and the Pole Updated 4-AUG-1992 by SIC Original by Robert Firth Paradoxes Contents These are the props. You own a barn, 40m long, with automatic doors at either end, that can be opened and closed simultaneously by a switch. You also have a pole, 80m long, which of course won't Read More Go to Site

		Physics News Update Number 399 - Story NONLOCALITY GETS MORE REAL ^Votes:0 SEARCH AIP Number 399 (Story #1), October 26, 1998 by Phillip F. Schewe and Ben Stein NONLOCALITY GETS MORE REAL . "Bell's Inequalities," the set of mathematical relations that would rule out the notion that distant quantum particles exert influences on each other at seemingly instantaneous rates, have now been violated over record large distances, with record high certainty, and with the elimination of an important loophole in three recent experiments, further solidifying the notion of "spooky action at a distance" in quantum particles. At the Optical Society of America meeting in Baltimore earlier this month, Paul Kwiat (kwiat@lanl.gov) of Los Alamos and his colleagues announced that they produced an ultrabright source of photon pairs for Bell's inequality experiments; they went on to ve Read More Go to Site

		Quantum Gravity ^Votes:0 QUANTUM GRAVITY Quantum cosmology M-theory, the theory formerly known as Strings The Holographic Principle and M-theory [Back] [Cosmology] [Black holes] [Cosmic strings] [Inflation] [Home] [Next] Read More Go to Site

		Quantum Gravity ^Votes:0 QUANTUM GRAVITY Quantum cosmology M-theory, the theory formerly known as Strings The Holographic Principle and M-theory [Back] [Cosmology] [Black holes] [Cosmic strings] [Inflation] [Home] [Next] Read More Go to Site

		Quantum Physics ^Votes:0 Next: Blackbody Radiation Up: Main physics index Previous: Quantum Physics Quantum Physics We have seen in the previous chapter that the properties of refraction, diffraction, and interference all require a wave picture of light. In this chapter we will begin to study other aspects associated with light which cannot be explained with a wave picture, but in fact need a particle picture. The coexistence of phenomena which require both a wave and a particle picture is called a wave-particle duality , and is at the heart of the modern theory of quantum physics. Blackbody Radiation The Photoelectric Effect Compton Scattering Wave-Particle Duality de Broglie Waves The Uncertainty Principle Problems www-admin@theory.uwinnipeg.ca 10/9/1997 Read More Go to Site

		Teleportation ^Votes:0 Quantum Teleportation Teleportation is the name given by science fiction writers to the feat of making an object or person disintegrate in one place while a perfect replica appears somewhere else. How this is accomplished is usually not explained in detail, but the general idea seems to be that the original object is scanned in such a way as to extract all the information from it, then this information is transmitted to the receiving location and used to construct the replica, not necessarily from the actual material of the original, but perhaps from atoms of the same kinds, arranged in exactly the same pattern as the original. A teleportation machine would be like a fax machine, except that it would work on 3-dimensional objects as well as documents, it would produce an exact copy rather Read More Go to Site

		The Physical World ^Votes:0 The Physical World "The Heavens Declare the Glory of God" Comet Hale-Bopp April 1997 We are fortunate to have, what appears to be, an umderstanding of some of the underlying science that makes up all we see and are. What we know, however , is contradictory. Quantum Mechanics seems to be totally at odds with what we call common sense. In this section hope to explore the physical world, to ask questions. Why is the universe explainable by quantum mechanics? Why are certain constants what they are? Why does the universe exist? How did life start? Let us start with an examination of Quantum phenomenon. Timothy Ferris has written a good article on this in the September 29th., 1996 issue of the New York Times Magazine . I have excerpted the following from that article. Quantum physics Read More Go to Site

		The Transactional Interpretation of Quantum Mechanics ^Votes:0 The Transactional Interpretation of Quantum Mechanics John G. Cramer Department of Physics University of Washington PO Box 351560 Seattle WA 98195-1560 USA This paper was originally published in Reviews of Modern Physics 58 , 647-688, July (1986). It is copyrighted (©1986) by John G. Cramer and the American Institute of Physics and may not be reproduced without permission. Reproduction of single printed copies for personal non-commercial use is authorized. See also "Generalized absorber theory and the Einstein-Podolsky-Rosen paradox", published in Physical Review D 22 , 362-376 (1980), "An Overview of the Transactional Interpretation of Quantum Mechanics", published in the International Journal of Theoretical Physics 27 , 227 (1988), and "Velocity Reversal and the Arrow of Time" , publishe Read More Go to Site

		Visual Quantum Mechanics ^Votes:0 Visual Quantum Mechanics The Visual Quantum Mechanics project, funded by the National Science Foundation, introduces quantum physics to high school and college students who do not have a background in modern physics or higher-level math. To reach these students, the instructional units integrate interactive computer programs and digital multimedia with inexpensive materials and written documents in an activity-based environment. © 1997-2004, Physics Education ResearchGroup , Kansas State University . Read More Go to Site

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