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to create more energy? ( d ) discuss the amount of this type of energy in a swimming pool as compared to that in, say, a gallon of gasoline, also taking into consideration that water is far more abundant. 34. how many kilograms of water are needed to obtain the 198. 8 mol of deuterium, assuming that deuterium is 0. 015... | openstax_college_physics_2e-web_7zesafu | [
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of the laser system during the brief pulse? ( b ) how many photons are in the pulse, given their wavelength is? ( c ) what is the total momentum of all these photons? ( d ) how does the total photon momentum compare with that of a single 1. 00 mev deuterium nucleus? 40. integrated concepts find the amount of energy giv... | openstax_college_physics_2e-web_7zesafu | [
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32. 6 fission 43. ( a ) calculate the energy released in the neutron - induced fission ( similar to the spontaneous fission in example 32. 3 ) given and. ( b ) this result is about 6 mev greater than the result for spontaneous fission. why? ( c ) confirm that the total number of nucleons and total charge are conserved ... | openstax_college_physics_2e-web_7zesafu | [
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better fission fuel. ( e ) look up the half - life of the final nucleus to see if it lives long enough to be a useful fuel. 49. the electrical power output of a large nuclear reactor facility is 900 mw. it has a 35. 0 % efficiency in converting nuclear power to electrical. ( a ) what is the thermal nuclear power output... | openstax_college_physics_2e-web_7zesafu | [
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32. 7 nuclear weapons 51. find the mass converted into energy by a 12. 0 - kt bomb. 52. what mass is converted into energy by a 1. 00 - mt bomb? 53. fusion bombs use neutrons from their fission trigger to create tritium fuel in the reaction. what is the energy released by this reaction in mev? 54. it is estimated that ... | openstax_college_physics_2e-web_7zesafu | [
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each reaction to be 5. ( c ) considering the masses found, does it seem reasonable that some missiles could carry 10 warheads? discuss, noting that the nuclear fuel is only a part of the mass of a warhead. 58. this problem gives some idea of the magnitude of the energy yield of a small tactical bomb. assume that half t... | openstax_college_physics_2e-web_7zesafu | [
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centimeters. ( a ) what two points on the x - axis are at the extremes of where the positrons annihilate the electrons? ( b ) what two points on the y - axis are at the extremes of where the positrons annihilate the electrons? ( c ) what can be said about the directions of the pair of gamma rays that result from the an... | openstax_college_physics_2e-web_7zesafu | [
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33. 6 guts : the unification of forces learning objectives by the end of this section, you will be able to : following ideas remarkably similar to those of the ancient greeks, we continue to look for smaller and smaller structures in nature, hoping ultimately to find and understand the most fundamental building blocks ... | openstax_college_physics_2e-web_7zesafu | [
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interactions of which explain atomic properties. protons and neutrons, the interactions of which explain the stability and abundance of elements, form the substructure of nuclei. protons and neutrons are not fundamental — they are composed of quarks. like electrons and a few other particles, quarks may be the fundament... | openstax_college_physics_2e-web_7zesafu | [
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33. 1 the yukawa particle and the heisenberg uncertainty principle revisited learning objectives by the end of this section, you will be able to : • define yukawa particle. • state the heisenberg uncertainty principle. • describe pion. • estimate the mass of a pion. • explain meson. particle physics as we know it today... | openstax_college_physics_2e-web_7zesafu | [
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force between a proton and a neutron. the pion has mass and can only be created by violating the conservation of 1468 33 • particle physics access for free at openstax. org mass - energy. this is allowed by the heisenberg uncertainty principle if it occurs for a sufficiently short period of time. as discussed in probab... | openstax_college_physics_2e-web_7zesafu | [
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. here, we use the heisenberg uncertainty principle in the simple form stated above, as developed in probability : the heisenberg uncertainty principle. first, we must calculate the time that the pion exists, given that the distance it travels at nearly the speed of light is about 1 fermi. then, the heisenberg uncertai... | openstax_college_physics_2e-web_7zesafu | [
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33. 1 • the yukawa particle and the heisenberg uncertainty principle revisited 1469 known at the time yukawa made his bold proposal. yukawa ’ s proposal of particle exchange as the method of force transfer is intriguing. but how can we verify his proposal if we cannot observe the virtual pion directly? if sufficient en... | openstax_college_physics_2e-web_7zesafu | [
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respected physicist i. i. rabi to comment, “ who ordered that? ” this remains a valid question today. we have discovered hundreds of subatomic particles ; the roles of some are only partially understood. but there are various patterns and relations to forces that have led to profound insights into nature ’ s secrets. | openstax_college_physics_2e-web_7zesafu | [
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33. 2 the four basic forces learning objectives by the end of this section, you will be able to : • state the four basic forces. • explain the feynman diagram for the exchange of a virtual photon between two positive charges. • define qed. • describe the feynman diagram for the exchange of a between a proton and a neut... | openstax_college_physics_2e-web_7zesafu | [
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. the two positive charges are seen to be repelled by the photon exchange. although these four forces are distinct and differ greatly from one another under all but the most extreme circumstances, we can see similarities among them. ( in guts : the unification of forces, we will discuss how the four forces may be diffe... | openstax_college_physics_2e-web_7zesafu | [
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with its deep implications for particle physics. why is it that particles called gluons are listed as the carrier particles for the strong nuclear force when, in the yukawa particle and the heisenberg uncertainty principle revisited, we saw that pions apparently carry that force? the answer is that pions are exchanged ... | openstax_college_physics_2e-web_7zesafu | [
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33. 2 • the four basic forces 1471 force is actually related to the indirectly observed but more fundamental gluons. in fact, all the carrier particles are thought to be fundamental in the sense that they have no substructure. another similarity among carrier particles is that they are all bosons ( first mentioned in p... | openstax_college_physics_2e-web_7zesafu | [
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situations. when particles are brought very close together, the relative strengths change, and they may become identical at extremely close range. as we shall see in guts : the unification of forces, carrier particles may be altered by the energy required to bring particles very close together — in such a manner that t... | openstax_college_physics_2e-web_7zesafu | [
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33. 3 accelerators create matter from energy learning objectives by the end of this section, you will be able to : • state the principle of a cyclotron. • explain the principle of a synchrotron. • describe the voltage needed by an accelerator between accelerating tubes. • state fermilab ’ s accelerator principle. befor... | openstax_college_physics_2e-web_7zesafu | [
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of experiments. energies produced by van de graaffs are insufficient to produce new particles, but they have been instrumental in exploring several aspects of the nucleus. another, equally famous, early accelerator is the cyclotron, invented in 1930 by the american physicist, e. o. lawrence ( 1901 – 1958 ). for a visua... | openstax_college_physics_2e-web_7zesafu | [
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to its velocity is called synchrotron radiation in honor of its importance in these machines. synchrotron radiation has a characteristic spectrum and polarization, and can be recognized in cosmic rays, implying large - scale magnetic fields acting on energetic and charged particles in deep space. synchrotron radiation ... | openstax_college_physics_2e-web_7zesafu | [
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33. 3 • accelerators create matter from energy 1473 figure 33. 8 cyclotrons use a magnetic field to cause particles to move in circular orbits. as the particles pass between the plates of the ds, the voltage across the gap is oscillated to accelerate them twice in each orbit. modern behemoths and colliding beams physic... | openstax_college_physics_2e-web_7zesafu | [
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be very large in order to accelerate particles to very high energies. ( b ) a positive particle is shown in the gap between accelerating tubes. ( c ) while the particle passes through the tube, the potentials are reversed so that there is another acceleration at the next gap. the frequency of the reversals needs to be ... | openstax_college_physics_2e-web_7zesafu | [
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accelerator were brought to the same energy and collided with electrons in specially designed detectors. linear accelerators use accelerating tubes similar to those in synchrotrons, but aligned in a straight line. this helps eliminate synchrotron radiation losses, which are particularly severe for electrons made to fol... | openstax_college_physics_2e-web_7zesafu | [
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from energy 1475 discussion a voltage of this magnitude is not difficult to achieve in a vacuum. much larger gap voltages would be required for higher energy, such as those at the 50 - gev slac facility. synchrotrons are aided by the circular path of the accelerated particles, which can orbit many times, effectively mu... | openstax_college_physics_2e-web_7zesafu | [
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33. 4 particles, patterns, and conservation laws learning objectives by the end of this section, you will be able to : • define matter and antimatter. • outline the differences between hadrons and leptons. • state the differences between mesons and baryons. in the early 1930s only a small number of subatomic particles ... | openstax_college_physics_2e-web_7zesafu | [
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that was discovered. in 1935, yukawa predicted pions as the carriers of the strong nuclear force, and they were eventually discovered. muons were discovered in cosmic ray experiments in 1937, and they seemed to be heavy, unstable versions of electrons and positrons. after world war ii, accelerators energetic enough to ... | openstax_college_physics_2e-web_7zesafu | [
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33. 6 1476 33 • particle physics access for free at openstax. org figure 33. 12 p. a. m. dirac ’ s theory of relativistic quantum mechanics not only explained a great deal of what was known, it also predicted antimatter. ( credit : cambridge university, cavendish laboratory ) matter and antimatter the positron was only... | openstax_college_physics_2e-web_7zesafu | [
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##ilate with other particles. however, particles of the same charge repel each other, so the more particles that are contained in a trap, the more energy is needed to power the magnetic field that contains them. it is not currently possible to store a significant quantity of antiprotons. at any rate, we now see that ne... | openstax_college_physics_2e-web_7zesafu | [
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from an examination of these particle characteristics. note that the carrier particles are called gauge bosons. first mentioned in patterns in spectra reveal more quantization, a | openstax_college_physics_2e-web_7zesafu | [
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33. 4 • particles, patterns, and conservation laws 1477 boson is a particle with zero or an integer value of intrinsic spin ( such as ), whereas a fermion is a particle with a half - integer value of intrinsic spin ( ). fermions obey the pauli exclusion principle whereas bosons do not. all the known and conjectured car... | openstax_college_physics_2e-web_7zesafu | [
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× 10 −8 497. 6 0 0 0 0 0. 90 × 10 −10 eta self 547. 9 0 0 0 0 0 2. 53 × 10 −19 ( many other mesons known ) baryons proton 938. 3 ± 1 0 0 0 0 stable6 neutron 939. 6 ± 1 0 0 0 0 882 lambda 1115. 7 ± 1 0 0 0 2. 63 × 10 −10 sigma 1189. 4 ± 1 0 0 0 0. 80 × 10 −10 1192. 6 ± 1 0 0 0 7. 4 × 10 −20 1197. 4 ± 1 0 0 0 1. 48 × 10 ... | openstax_college_physics_2e-web_7zesafu | [
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0. 82 × 10 −10 ( many other baryons known ) table 33. 2 selected particle characteristics7 all known leptons are listed in the table given above. there are only six leptons ( and their antiparticles ), and they seem to be fundamental in that they have no apparent underlying structure. leptons have no discernible size o... | openstax_college_physics_2e-web_7zesafu | [
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33. 4 • particles, patterns, and conservation laws 1479 which implied another “ family ” and associated conservation principle. the particle is a muon ’ s neutrino, and it is created to conserve muon family number. so muons are leptons with a family of their own, and conservation of total also seems to be obeyed in man... | openstax_college_physics_2e-web_7zesafu | [
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of the conservation of the total baryon number. forces, reactions, and reaction rates the forces that act between particles regulate how they interact with other particles. for example, pions feel the strong force and do not penetrate as far in matter as do muons, which do not feel the strong force. ( this was the way ... | openstax_college_physics_2e-web_7zesafu | [
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weak or strong force. yet another quantum number emerges from decay lifetimes and patterns. note that the particles, and decay with lifetimes on the order of s ( the exception is, whose short lifetime is explained by its particular quark substructure. ), implying that their decay is caused by the weak force alone, alth... | openstax_college_physics_2e-web_7zesafu | [
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33. 8 1480 33 • particle physics access for free at openstax. org systematics. it is found that strangeness is conserved by the strong force, which governs the production of most of these particles in accelerator experiments. however, strangeness is not conserved by the weak force. this conclusion is reached from the f... | openstax_college_physics_2e-web_7zesafu | [
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decay is allowed if charge, baryon number, mass - energy, and lepton numbers are conserved. strangeness can change due to the weak interaction. charge is conserved as. baryon number is conserved, since all particles have. mass - energy is conserved in the sense that the has a greater mass than the products, so that the... | openstax_college_physics_2e-web_7zesafu | [
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murray gell - mann ( b. 1929 ) proposed quarks as a substructure of hadrons in 1963 and was already known for his work on the concept of strangeness. although quarks have never been directly observed, several predictions of the quark model were quickly confirmed, and their properties explain all known hadron characteri... | openstax_college_physics_2e-web_7zesafu | [
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33. 5 quarks : is that all there is? learning objectives by the end of this section, you will be able to : • define fundamental particle. • describe quark and antiquark. • list the flavors of quark. • outline the quark composition of hadrons. • determine quantum numbers from quark composition. quarks have been mentione... | openstax_college_physics_2e-web_7zesafu | [
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were first proposed independently by american physicists murray gell - mann and george zweig in 1963. their quaint name was taken by gell - mann from a james joyce novel — gell - mann was also largely responsible for the concept and name of strangeness. ( whimsical names are common in particle physics, reflecting the p... | openstax_college_physics_2e-web_7zesafu | [
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##s uud, so that its total charge is, as expected. with the spins aligned as in the figure, the proton ’ s intrinsic spin is, also as expected. note that the spins of the up quarks are aligned, so that they would be in the same state except that they have different colors ( another quantum number to be elaborated upon ... | openstax_college_physics_2e-web_7zesafu | [
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33. 5 • quarks : is that all there is? 1483 name symbol antiparticle spin charge 8 mass 9 bottom 1 / 2 0 0 0 5 top 1 / 2 0 0 0 173 table 33. 3 quarks and antiquarks10 particle quark composition mesons, mixture11, mixture12 baryons13, 14 11 these two mesons are different mixtures, but each is its own antiparticle, as in... | openstax_college_physics_2e-web_7zesafu | [
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and an antiquark with baryon numbers. the half - life is relatively long since, although it is composed of matter and antimatter, the quarks are different flavors and the weak force should cause the decay by changing the flavor of one into that of the other. the spins of the and quarks are antiparallel, enabling the pi... | openstax_college_physics_2e-web_7zesafu | [
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complete, the should exist. it was first observed in 1964 at brookhaven national laboratory and had the predicted characteristics as seen in figure 33. 16. the discovery of the was convincing indirect evidence for the existence of the three original quark flavors and boosted theoretical and experimental efforts to furt... | openstax_college_physics_2e-web_7zesafu | [
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33. 5 • quarks : is that all there is? 1485 figure 33. 16 the image relates to the discovery of the. it is a secondary reaction in which an accelerator - produced collides with a proton via the strong force and conserves strangeness to produce the with characteristics predicted by the quark model. as with other predict... | openstax_college_physics_2e-web_7zesafu | [
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particle physics access for free at openstax. org discussion this procedure is similar to what the inventors of the quark hypothesis did when checking to see if their solution to the puzzle of particle patterns was correct. they also checked to see if all combinations were known, thereby predicting the previously unobs... | openstax_college_physics_2e-web_7zesafu | [
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particles. more energy produces more particles, not a separation of quarks. conservation of momentum requires that the particles come out in jets along the three paths in which the quarks were being pulled. note that there are only three jets, and that other characteristics of the particles are consistent with the thre... | openstax_college_physics_2e-web_7zesafu | [
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33. 5 • quarks : is that all there is? 1487 particle trajectories and the cyan dots represent the energy depositions in the sensitive detector elements. ( credit : matevz tadel ) quarks have their ups and downs the quark model actually lost some of its early popularity because the original model with three quarks had t... | openstax_college_physics_2e-web_7zesafu | [
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. theorists quickly proposed two more quark flavors called top ( t ) or truth and bottom ( b ) or beauty to keep the number of quarks the same as the number of leptons. and in 1976, the upsilon ( ) meson was discovered and shown to be composed of a bottom and an antibottom quark or, quite analogous to the being as seen... | openstax_college_physics_2e-web_7zesafu | [
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##yons are made of three quarks, why mesons are a quark and an antiquark, and why we cannot isolate a single quark. the force between the quarks is such that their combined colors produce white. this is illustrated in figure 33. 19. a baryon must have one of each primary color or rgb, which produces white. a meson must... | openstax_college_physics_2e-web_7zesafu | [
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exclusion principle. particles such as the, which is composed of three strange quarks,, and the, which is three up quarks, uuu, can exist because the quarks have different colors and do not have the same quantum numbers. color is consistent with all observations and is now widely accepted. quark theory including color ... | openstax_college_physics_2e-web_7zesafu | [
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decay into the lowest, leaving only u and d quarks. we have long sought connections between the forces in nature. since these are carried by particles, we will explore connections between gluons, and, and photons as part of the search for unification of forces discussed in guts : the unification of forces.. figure 33. ... | openstax_college_physics_2e-web_7zesafu | [
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33. 6 guts : the unification of forces learning objectives by the end of this section, you will be able to : • state the grand unified theory. • explain the electroweak theory. • define gluons. • describe the principle of quantum chromodynamics. • define the standard model. present quests to show that the four basic fo... | openstax_college_physics_2e-web_7zesafu | [
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33. 6 • guts : the unification of forces 1489 analogy to the unification of electric and magnetic forces is quite good — the four forces are distinct under normal circumstances, but there are hints of connections even on the atomic scale, and there may be conditions under which the forces are intimately related and eve... | openstax_college_physics_2e-web_7zesafu | [
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1979 nobel prize for other aspects of electroweak theory. figure 33. 21 the exchange of a virtual carries the weak nuclear force between an electron and a neutrino in this feynman diagram. the is one of the carrier particles for the weak nuclear force that has now been created in the laboratory with characteristics pre... | openstax_college_physics_2e-web_7zesafu | [
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can change the colors of quarks when exchanged, as seen in figure 33. 22 ( b ). in the figure, a red down quark interacts with a green strange quark by sending it a gluon. that gluon carries red away from the down quark 1490 33 • particle physics access for free at openstax. org and leaves it green, because it is an ( ... | openstax_college_physics_2e-web_7zesafu | [
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feynman diagram is the same interaction as shown in figure 33. 6, but it shows the quark and gluon details of the strong force interaction. it is beyond the scope of this text to go into more detail on the types of quark and gluon interactions that underlie the observable particles, but the theory ( quantum chromodynam... | openstax_college_physics_2e-web_7zesafu | [
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33. 6 • guts : the unification of forces 1491 how can forces be unified? they are definitely distinct under most circumstances, for example, being carried by different particles and having greatly different strengths. but experiments show that at extremely small distances, the strengths of the forces begin to become mo... | openstax_college_physics_2e-web_7zesafu | [
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higgs boson with a mass of 125 gev, and there is a possibility of a direct discovery during 2012. the existence of this more massive particle would give validity to the theory that the carrier particles are identical under certain circumstances. figure 33. 24 the relative strengths of the four basic forces vary with di... | openstax_college_physics_2e-web_7zesafu | [
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are also proposed to underlie all particles, forces, and space itself. predicts that the other forces become identical under conditions so extreme that they cannot be tested in the laboratory, although there may be lingering evidence of them in the evolution of the universe. gut is also successful in describing a syste... | openstax_college_physics_2e-web_7zesafu | [
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tiny fraction of a second after the fabled big bang, forces would have been unified and may have left their fingerprint on the existing universe. this, one of the most exciting forefronts of physics, is the subject of frontiers of physics. figure 33. 25 in the tevatron accelerator at fermilab, protons and antiprotons c... | openstax_college_physics_2e-web_7zesafu | [
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33. 6 • guts : the unification of forces 1493 glossary baryon number a conserved physical quantity that is zero for mesons and leptons and for baryons and antibaryons, respectively baryons hadrons that always decay to another baryon boson particle with zero or an integer value of intrinsic spin bottom a quark flavor ch... | openstax_college_physics_2e-web_7zesafu | [
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, would give validity to the theory that carrier particles are identical under certain circumstances leptons particles that do not feel the strong nuclear force linear accelerator accelerator that accelerates particles in a straight line meson hadrons that can decay to leptons and leave no hadrons meson particle whose ... | openstax_college_physics_2e-web_7zesafu | [
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their effects can be directly observed 1494 33 • glossary access for free at openstax. org section summary 33. 1 the yukawa particle and the heisenberg uncertainty principle revisited • yukawa ’ s idea of virtual particle exchange as the carrier of forces is crucial, with virtual particles being formed in temporary vio... | openstax_college_physics_2e-web_7zesafu | [
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33. 4 particles, patterns, and conservation laws • all particles of matter have an antimatter counterpart that has the opposite charge and certain other quantum numbers as seen in table 33. 2. these matter - antimatter pairs are otherwise very similar but will annihilate when brought together. known particles can be di... | openstax_college_physics_2e-web_7zesafu | [
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33. 5 quarks : is that all there is? • hadrons are thought to be composed of quarks, with baryons having three quarks and mesons having a quark and an antiquark. • the characteristics of the six quarks and their antiquark counterparts are given in table 33. 3, and the quark compositions of certain hadrons are given in ... | openstax_college_physics_2e-web_7zesafu | [
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33. 6 guts : the unification of forces • attempts to show unification of the four forces are called grand unified theories ( guts ) and have been partially successful, with connections proven between em and weak forces in electroweak theory. • the strong force is carried by eight proposed particles called gluons, which... | openstax_college_physics_2e-web_7zesafu | [
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33. 4 particles, patterns, and conservation laws 5. large quantities of antimatter isolated from normal matter should behave exactly like normal matter. an antiatom, for example, composed of positrons, antiprotons, and antineutrons should have the same atomic spectrum as its matter counterpart. would you be able to tel... | openstax_college_physics_2e-web_7zesafu | [
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, leaving no other baryon? 13. explain how conservation of baryon number is responsible for conservation of total atomic mass ( total number of nucleons ) in nuclear decay and reactions. | openstax_college_physics_2e-web_7zesafu | [
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33. 5 quarks : is that all there is? 14. the quark flavor change takes place in decay. does this mean that the reverse quark flavor change takes place in decay? justify your response by writing the decay in terms of the quark constituents, noting that it looks as if a proton is converted into a neutron in decay. 15. ex... | openstax_college_physics_2e-web_7zesafu | [
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what does a change in quark flavor imply about the force that is responsible? 24. ( a ) do all particles having strangeness also have at least one strange quark in them? ( b ) do all hadrons with a strange quark also have nonzero strangeness? 25. the sigma - zero particle decays mostly via the reaction. explain how thi... | openstax_college_physics_2e-web_7zesafu | [
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33. 1 the yukawa particle and the heisenberg uncertainty principle revisited 1. a virtual particle having an approximate mass of may be associated with the unification of the strong and electroweak forces. for what length of time could this virtual particle exist ( in temporary violation of the conservation of mass - e... | openstax_college_physics_2e-web_7zesafu | [
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33. 3 accelerators create matter from energy 6. at full energy, protons in the 2. 00 - km - diameter fermilab synchrotron travel at nearly the speed of light, since their energy is about 1000 times their rest mass energy. ( a ) how long does it take for a proton to complete one trip around? ( b ) how many times per sec... | openstax_college_physics_2e-web_7zesafu | [
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taking into account the annihilation of the two masses? ( note that this is not significantly greater than the extremely relativistic kinetic energy. ) 12. when an electron and positron collide at the slac facility, they each have 50. 0 gev kinetic energies. what is the total collision energy available, taking into acc... | openstax_college_physics_2e-web_7zesafu | [
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33. 4 particles, patterns, and conservation laws 13. the is its own antiparticle and decays in the following manner :. what is the energy of each ray if the is at rest when it decays? 14. the primary decay mode for the negative pion is. what is the energy release in mev in this decay? 15. the mass of a theoretical part... | openstax_college_physics_2e-web_7zesafu | [
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that the decay mode is ( so that all the mass is destroyed )? 20. ( a ) what is the uncertainty in the energy released in the decay of a due to its short lifetime? ( b ) is the uncertainty in this energy greater than or less than the uncertainty in the mass of the tau neutrino? discuss the source of the uncertainty. | openstax_college_physics_2e-web_7zesafu | [
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33. 5 quarks : is that all there is? 21. ( a ) verify from its quark composition that the particle could be an excited state of the proton. ( b ) there is a spread of about 100 mev in the decay energy of the, interpreted as uncertainty due to its short lifetime. what is its approximate lifetime? ( c ) does its decay pr... | openstax_college_physics_2e-web_7zesafu | [
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##man diagram of the reaction showing the individual quarks involved. 24. one of the decay modes of the omega minus is. ( a ) what is the change in strangeness? ( b ) verify that baryon number and charge are conserved, while lepton numbers are unaffected. ( c ) write the equation in terms of the constituent quarks, ind... | openstax_college_physics_2e-web_7zesafu | [
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combinations are possible? ( b ) this number is less than the number of known baryons. explain why. 34. ( a ) show that the conjectured decay of the proton,, violates conservation of baryon number and conservation of lepton number. ( b ) what is the analogous decay process for the antiproton? 35. verify the quantum num... | openstax_college_physics_2e-web_7zesafu | [
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particle has the quark composition? ( b ) what should its decay mode be? 42. ( a ) show that all combinations of three quarks produce integral charges. thus baryons must have integral charge. ( b ) show that all combinations of a quark and an antiquark produce only integral charges. thus mesons must have integral charg... | openstax_college_physics_2e-web_7zesafu | [
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33. 6 guts : the unification of forces 43. integrated concepts the intensity of cosmic ray radiation decreases rapidly with increasing energy, but there are occasionally extremely energetic cosmic rays that create a shower of radiation from all the particles they create by striking a nucleus in the atmosphere as seen i... | openstax_college_physics_2e-web_7zesafu | [
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and has momentum, just like a photon. 48. integrated concepts plans for an accelerator that produces a secondary beam of k - mesons to scatter from nuclei, for the purpose of studying the strong force, call for them to have a kinetic energy of 500 mev. ( a ) what would the relativistic quantity be for these particles? ... | openstax_college_physics_2e-web_7zesafu | [
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of the supernova only places an upper limit on the neutrino ’ s mass. ( hint : you may need to use a series expansion to find v for the neutrino, since its is so large. ) 51. construct your own problem consider an ultrahigh - energy cosmic ray entering the earth ’ s atmosphere ( some have energies approaching a joule )... | openstax_college_physics_2e-web_7zesafu | [
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##s 34. 4 dark matter and closure 34. 5 complexity and chaos 34. 6 high - temperature superconductors | openstax_college_physics_2e-web_7zesafu | [
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34. 7 some questions we know to ask frontiers are exciting. there is mystery, surprise, adventure, and discovery. the satisfaction of finding the answer to a question is made keener by the fact that the answer always leads to a new question. the picture of nature becomes more complete, yet nature retains its sense of m... | openstax_college_physics_2e-web_7zesafu | [
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34. 1 cosmology and particle physics learning objectives by the end of this section, you will be able to : • discuss the expansion of the universe. • explain the big bang. look at the sky on some clear night when you are away from city lights. there you will see thousands of individual stars and a faint glowing backgro... | openstax_college_physics_2e-web_7zesafu | [
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nuclei explain the hot interior of the earth. fusion of nuclei likewise explains the energy of stars. today, the patterns in particle physics seem to be explaining the evolution and character of the universe. and the nature of the universe has implications for unexplored regions of particle physics. cosmology is the st... | openstax_college_physics_2e-web_7zesafu | [
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between galaxies is on the order of a million light years, but it varies greatly with galaxies forming clusters such as shown in figure 34. 2. the magellanic clouds, for example, are small galaxies close to our own, some 160, 000 light years from earth. the andromeda galaxy is a large spiral galaxy like ours and lies 2... | openstax_college_physics_2e-web_7zesafu | [
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34. 1 • cosmology and particle physics 1505 figure 34. 4 ( a ) andromeda is the closest large galaxy, at 2 million light years distance, and is very similar to our milky way. the blue regions harbor young and emerging stars, while dark streaks are vast clouds of gas and dust. a smaller satellite galaxy is clearly visib... | openstax_college_physics_2e-web_7zesafu | [
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basis, the hallmark of a field in its golden age. perhaps the most important characteristic of the universe is that all galaxies except those in our local cluster seem to be moving away from us at speeds proportional to their distance from our galaxy. it looks as if a gigantic explosion, universally called the big bang... | openstax_college_physics_2e-web_7zesafu | [
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concept in cosmology. its value is determined by taking the slope of a graph of velocity versus distance, obtained from red shift measurements, such as shown in figure 34. 5. we shall use an approximate value of thus, is an average behavior for all but the closest galaxies. for example, a galaxy 100 mly away ( as deter... | openstax_college_physics_2e-web_7zesafu | [
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time, the big bang would have occurred between 13 and 15 billion years ago when all matter would have been at a point. questions instantly arise. what caused the explosion? what happened before the big bang? was there a before, or did time start then? will the universe expand forever, or will gravity reverse it into a ... | openstax_college_physics_2e-web_7zesafu | [
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34. 1 • cosmology and particle physics 1507 figure 34. 6 galaxies are flying apart from one another, with the more distant moving faster as if a primordial explosion expelled the matter from which they formed. the most distant known galaxies move nearly at the speed of light relative to us. the russian - born american ... | openstax_college_physics_2e-web_7zesafu | [
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. 7 ( a ) the big bang is used to explain the present observed expansion of the universe. it was an incredibly energetic explosion some 10 to 20 billion years ago. after expanding and cooling, galaxies form inside the now - cold remnants of the primordial fireball. ( b ) the spectrum of cosmic microwave radiation is th... | openstax_college_physics_2e-web_7zesafu | [
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2. 725 k, the expansion - cooled temperature of the big bang ’ s remnant. this radiation can be measured coming from any direction in space not obscured by some other source. it is compelling evidence of the creation of the universe in a gigantic explosion, already indicated by galactic red shifts. matter versus antima... | openstax_college_physics_2e-web_7zesafu | [
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34. 1 • cosmology and particle physics 1509 particle physics seems symmetric in matter and antimatter. why isn ’ t the cosmos? the answer is that particle physics is not quite perfectly symmetric in this regard. the decay of one of the neutral - mesons, for example, preferentially creates more matter than antimatter. t... | openstax_college_physics_2e-web_7zesafu | [
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example of an answer producing more questions. ) furthermore, galaxies are observed very far from us, so that they formed very long ago. the problem was to explain how galaxies could form so early and so quickly after the big bang if its remnant fingerprint is perfectly smooth. the answer is that if you look very close... | openstax_college_physics_2e-web_7zesafu | [
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cross ( there is no zero on an exponential scale ). rather, they extend indefinitely in ever - smaller time intervals to some infinitesimal point. 1510 34 • frontiers of physics access for free at openstax. org figure 34. 9 the evolution of the universe from the big bang onward is intimately tied to the laws of physics... | openstax_college_physics_2e-web_7zesafu | [
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