Nuclear Weapons - basic technology concepts [UNC] A few words about nuclear weapons technology..
Fission weapons Nuclear weapons exploit two principle physical, or more specifically nuclear, properties of certain substances: fission and fusion. Fission is possible in a number of heavy elements, but in weapons it is principally confined to what is termed slow neutron fission in just two particular isotopes: 235U and 239Pu. These are termed fissile, and are the source of energy in atomic weapons. An explosive chain reaction can be started with relatively slight energy input (so-called slow neutrons) in such material. An actual 239Pu ingot, alloyed with gallium for improved physical properties Isotopes are 'varieties' of an element which differ only in their number of neutrons. Typical appearance of a thermonuclear weapon detonation -- from many miles away. *Special techniques were required to record the fleeting moments of a weapon's initial detonation.
Hubble Picture Album: Nebulae. The Size of Our World. All (known) Bodies in the Solar System Larger than 200 Miles in Diameter. Physics 20b: Introduction to Cosmology - Spring 2010 - Download free content from UC Irvine. Relativity Tutorial. Galilean Relativity Relativity can be described using space-time diagrams. Contrary to popular opinion, Einstein did not invent relativity. Galileo preceded him. Aristotle had proposed that moving objects (on the Earth) had a natural tendency to slow down and stop. This is shown in the space-time diagram below. Note the curved worldline above. Now it is still moving in its final state. Straight worldlines (unaccelerated particles) remain straight in this process. But Galilean transformations do not preserve velocity.
Special Relativity But 200 years after Newton the theory of electromagnetism was developed into Maxwell's equations. Because the speed of light is special, space-time diagrams are often drawn in units of seconds and light-seconds, or years and light-years, so a unit slope [45 degree angle] corresponds to the speed of light. The left-hand section of the figure shows the Galilean transformation into the frame of reference of the moving observer. Radar Time Dilation. University lectures physics. Whether your goal is to earn a promotion, graduate at the top of your class, or just accelerate your life.
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The lectures are available to anybody, completely free of charge. Lecture courses are a valid and vital learning tool, and may be one of the best methods of learning available. Free Physics Books. Quantum Mechanics:A graduate level course. Physics I: Classical Mechanics - Download free content from MIT. Quantum Entanglement and Information. First published Mon Aug 13, 2001; substantive revision Thu Aug 26, 2010 Quantum entanglement is a physical resource, like energy, associated with the peculiar nonclassical correlations that are possible between separated quantum systems.
Entanglement can be measured, transformed, and purified. A pair of quantum systems in an entangled state can be used as a quantum information channel to perform computational and cryptographic tasks that are impossible for classical systems. The general study of the information-processing capabilities of quantum systems is the subject of quantum information theory. 1. In 1935 and 1936, Schrödinger published a two-part article in the Proceedings of the Cambridge Philosophical Society in which he discussed and extended a remarkable argument by Einstein, Podolsky, and Rosen. It should not be supposed that Einstein's definition of a complete theory included the requirement that it be deterministic. He added (Schrödinger, 1935; p. 555): Quantum Physics made simple. Imagining the Tenth Dimension - A Book by Rob Bryanton.
Physics/Time. Open Course : Astronomy : Introduction : Lecture 1 : Science of Astronomy.