2. Now we move the detector to the bottom or base of the mountain. How long will it take the muon particles to travel 2000 meters at the given velocity? 3. According to the muon decay formula above, approximately how many muons are expected to survive from the top to the base of the mountain?
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- Referring to the Feynman diagram, name:a. particle A b. the exchange particle involved c. the force involved in the interaction d. Explain how you know that there has not been a change of quark colour but there has been a change of flavour.1. If a proton is moving at very high speed, so that its kinetic energy is much greater than its rest energy (mc²), can it then decay via p →n + n+? 2. What would an “antiatom," made up of the antiparticles to the constituents of normal atoms, consist of? What might happen if antimatter, made of such antiatoms, came in contact with our normal world of matter?Q4. A neutron at rest decays into a proton with a decay energy of 0.782 Me. What will be the maximum kinetic energy of the residual proton?
- 3. What magnetic field is required for the 7.0-TeV protons in the 4.25-km radius Large Hadron Collider (LHC)? 4. Show that the energy of a particle (charge q.) in a synchotron, in the relativistic limit (v z c), is given by E = Brc, where E is measured in eV, B is the magnetic field, and r is the radius of the orbit.1 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 A) time dilation B) length contraction C)the equivalence of mass and energy D)principle of relativity E)none of the other choices 2 Which of the following is not a fundamental force in nature? A) mass energy interaction B) strong interaction C) weak interaction D) electromagnetic interaction E) gravitational interaction 3 These particles possess half-integral spins and obey Pauli exclusion principles A )fermions B) boson C) muon D)hadron E)photonDetermine which of the following decays or reactions is not allowed and explain why. (a) p + p → p + π++Λ+-K0 (b) Λ → p + π0
- 7. What are the wavelengths of the two photons produced when a proton and antiproton annihilate? 8. The A° cannot decay by the following reactions. What conservation laws are violated in each of the reactions? (а) Л° - п+п-. (b) A° + p+ K¯. (c) A° + n+ + T¯.5. Pion beams (*) are used to treat cancer in radiation therapy. The energy comes from the decay of the pions. Negative pions usually decay into a muon and a muon antineutrino. (a) (b) Write out the complete decay of a л into stable particles. How much energy is released from a complete decay? Assume the neutrino masses are negligible. (c) How many pions need to decay to give a dose of 50.0 Gy to 10.0 grams of tissue?2. Draw a Feynman diagram for each of the following reactions, provided it is allowed. If the reaction is forbidden explain why. μ → eveVμ τ' →μνμύτ Vμе- → Veft- Vμe+ → Vel+ Vμe+ → Vef+ Vμnμp VμP →μ+n eté → VμVμ ete- →T+T- e¯e → ee