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What medical technologies (e.g., PET) rely on the physics of elementary particles?
In elementary-particle physics as in most fields of science, advances in understanding are closely coupled to advances in technology. [ Many technical obstacles exist in the search for fundamental physics, and much of the creative effort of elementary-particle physicists, both experimental and theoretical, is devoted to overcoming these obstacles: Higher-energy accelerators are needed to cross
thresholds for suspected new phenomena, and machines of higher luminosity open opportunities for the observation of rare and unexpected processes. Advances in accelerator technology must be accompanied by advances in detector technology as more complicated particle collisions are produced. Further advances in computing technology are necessary both to enable the processing of complex data samples and to allow comparison between various theoretical models and experimental results. Experimenters have often made great advances when they have been able to borrow a technology developed for other uses and modify it to allow advances in particle physics. Similarly, a technology has often been developed specifically to address the needs of the elementary-particle physics community but then has been adapted to meet the needs of society outside particle physics. Although it is often evident where the technical barriers in elementary-particle physics (EPP) reside, it is much more difficult to predict where the breakthroughs will be and how they will come about. Experience has shown, however, that innovative new technologies or innovative uses for existing technologies will find surprising applications beyond those originally conceived by the developers. ]
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Asked 10/2/2012 7:07:18 PM
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In theory, when were the four fundamental forces unified? User: What medical technologies (e.g., PET) rely on the physics of elementary particles?
Weegy: Unifying the Fundamental Forces Many physicists believe that all four of the fundamental forces are, in fact, the manifestations of a single underlying (or unified) force which has yet to be discovered. [ Just as electricity, magnetism, and the weak force were unified into the electroweak interaction, they work to unify all of the fundamental forces. The current quantum mechanical interpretation of these forces is that the particles do not interact directly, but rather manifest virtual particles that mediate the actual interactions. All of the forces except for gravity have been consolidated into this "Standard Model" of interaction. The effort to unify gravity with the other three fundamental forces is called quantum gravity. It postulates the existence of a virtual particle called the graviton, which would be the mediating element in gravity interactions. To date, gravitons have not been detected and no theories of quantum gravity have been successful or universally adopted. ] (More)
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Asked 10/2/2012 6:56:56 PM
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Why are there so many different kinds of hadrons but only a few kinds of leptons?
Weegy: There are two kinds of particles: hadrons which feel the strong nuclear force, the force that holds protons and neutrons together in the atomic nucleus; and leptons, which do not feel that force, [ the electron being the best-known example. There are only a few leptons: the electron, the heavier "electron-like" particle the muon, and the electrically neutral, massless or very-low-mass neutrino. There are hundreds of types of hadron: as well as the well-known proton and neutron, and the pion (known since the late 40's), there are many particles with distinguishable properties but lifetimes of only a tiny fraction of a second. There are some patterns or "family resemblances" among them, but no obvious system (like, say, 19th century chemistry's Periodic Table of the elements) to connect them all. ] (More)
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Asked 10/2/2012 7:17:13 PM
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