Exam 12: Special Relativity and Elementary Particles

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Leptons are built out of quarks.

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False

Some antiparticles are identical to the particles they correspond to.

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Mesons are composed of three-quark combinations.

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Einstein's famous equation E = mc2 is a statement of __________.

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Quarks,originally isolated in cosmic ray showers,are elementary particles possessing electric charge equal to 1/3 or 2/3 the magnitude of the charge of a proton.

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What is the quark structure of a neutron?

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What is the quark composition of the Δ++? It has no strangeness,no charm,and no top-ness or bottom-ness.Its spin is 3/2.

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(a)What is the rest energy (in joules)of a subatomic particle whose (rest)mass is 6.7 × 10−31 kg? (b)How many MeV's of energy is this?

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When it comes near a heavy nucleus,a gamma ray,which is a high energy photon,can "disappear," and in its place there will be produced an electron and a positron,which both have mass.According to special relativity,this pair production is an example of __________.

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A fermion has integral spin.

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From the point of view of an observer on the Earth,a muon produced high in the atmosphere can reach the ground before decaying because

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A photon is a boson.

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How many quark flavors are there?

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A particle with ____________ obeys the Pauli exclusion principle.

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__________ is the prediction of special relativity that moving clocks run slow.

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​Match each item with the correct statement below.​ -these particles possess half-integral spins

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Because of their short lifetimes,very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the Earth.Yet we detect large numbers of muons at ground level because of

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Steven Weinberg,Abdus Salam,and Sheldon Glashow shared the 1979 Nobel Prize in physics for their development of a(n)

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A boson has half-integral spin.

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Electroweak theory results in models for combining the electromagnetic,weak and strong nuclear interactions into a single basic force.

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