how to use barcode reader in asp.net c# Figure 30-13 This false-color bubble chamber photograph shows the tracks of charged particles in Objective-C

Generation QR-Code in Objective-C Figure 30-13 This false-color bubble chamber photograph shows the tracks of charged particles

Figure 30-13 This false-color bubble chamber photograph shows the tracks of charged particles
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Figure 30-14 The Collider Detector at Fermilab (CDF) records the tracks from billions of collisions (a) A CDF computer image of a top quark event is shown (b)
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Section 303 The Building Blocks of Matter
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(t)Science VU/Visuals Unlimited, (l)David Parker/Photo Researchers, (r)Fermilab/Photo Researchers
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Elementary Particles
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The model of the atom in 1930 was fairly simple: protons and neutrons surrounded by electrons There also was a particle with no mass called a gamma particle (photon) Different combinations of these four elementary particles seemed to describe the contents of the universe quite well More detailed studies of radioactive decay disturbed this simple picture While the particles and gamma rays emitted by radioactive nuclei have single energies that depend on the decaying nucleus, particles are emitted with a wide range of energies One might expect the energy of the particles to be equal to the difference between the energy of the nucleus before decay and the energy of the nucleus produced by the decay In fact, the wide range of energies of electrons emitted during beta decay suggested to Niels Bohr that energy might not be conserved in nuclear reactions Wolfgang Pauli in 1931 and Enrico Fermi in 1934 suggested that an unseen neutral particle was emitted with the particle Named the neutrino ( little neutral one in Italian) by Fermi, the particle, which is actually an antineutrino, was not directly observed until 1956 Studies with cosmic rays discovered more particles A positive electron, or positron, was found in 1932, and what seemed to be a heavy electron, the muon, in 1937 In 1935, a remarkable hypothesis by Japanese physicist Hideki Yukawa spurred much research in the years to follow Yukawa hypothesized the existence of a new particle that could carry the nuclear force through space, just as the photon carries the electromagnetic force In 1947 a possible particle, the pion, was discovered While it was not the carrier of the strong force, it was a new type of matter Experiments with particle accelerators resulted in the identification of more and more particles, some with intermediate masses, others much more massive than the proton They had positive and negative charges, or none at all Some lifetimes were 10 23 s, while others had no detectable decays Most mysterious were the chargeless, massless neutrinos At one point Enrico Fermi, asked to identify a particle track, replied If I could remember the names of all these particles, I d be a botanist!
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Figure 30-15 Even though quarks have fractional charges, all the particles they make have whole-number charges
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The Standard Model
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How could all these particles be called elementary By the late 1960s it became clear that neither protons, neutrons, nor pions were elementary They themselves are made up of particles called quarks, as shown in Figure 30-15 Electrons and neutrinos belong to a different family, called leptons Physicists now believe that all particles can be grouped into three families: quarks, leptons, and force carriers This model of the building blocks of matter is called the Standard Model Quarks make up the threequark baryons, the two-quark mesons, and the recently discovered fivequark pentaquarks Leptons are particles like electrons and neutrinos There are six different quarks and six different leptons Quarks and leptons form matter, while force carriers are particles that carry, or transmit, forces between matter For example, photons carry the electromagnetic interaction Eight particles, called gluons, carry the strong nuclear interaction that binds quarks into protons and the protons and neutrons into nuclei Three particles, the weak bosons, are involved in beta decay
1 e 3
Proton u
2 e 3
1 e 3
1 e 3
Neutron u
2 e 3
1 e 3
Pion
30 Nuclear Physics
Quarks and Leptons Z W
Bosons
Top quark
104 Bottom quark Mass (MeV) Charm quark 103 Muon 102 Tau Strange quark
Down quark Up quark
100 Electron 10 10
Figure 30-16 The known quarks and leptons are divided into three families The everyday world is made from particles in the lefthand family (u, d, e) Particles in the middle group (c, s, ) are found in cosmic rays and are routinely produced in particle accelerators Particles in the righthand family (b, t, ) are believed to have existed briefly during the earliest moments of the Big Bang and are created in high-energy collisions The bosons carry the weak, electromagnetic, strong, and gravitational forces Masses are stated as energy equivalents, given by Einstein s formula E mc 2
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