2. Draw a Feynman diagram for each of the following reactions, provided it is allowed. If the reaction is forbidden explain why. μ→ eveVμ T→μ¯¯VμVT Vμe → Velt Vμe+ →vel+ Vue+ → Del+ vun HP VµP →µ+n eté → μVμ ete-T+T- e¯¯ee¯¯e
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- Question 30 Which of the following is true about the Klein-Gordon equation? O The Klein-Gordon equation is the relativistic generalization of the Schrodinger equation. O The Klein-Gordon equation applies to spin-zero particle. O The Klein-Gordon equation correctly predicts the spin of the electron. O The Klein-Gordon equation gives the correct energy levels in hydrogen.4. Suppose some object in space emits a muon and a photon at the same time. The muon's decay timescale is 2.2 usec. This is actually a characteristic decay time, but for this problem, we will assume it's the maximum lifetime of the muon. Let this object in space be at a distance of 100 light years from Earth. How much sooner will the photon, which moves at the speed of light, arrive at Earth than the muon?13. Draw a Feynman diagram for the reaction n+ vµ → p+ µ-.
- 4. Typical measurements of the mass of a A particle (1230 MeV/c²) are shown in the figure. Although the lifetime of the delta is much too short to measure directly, it can be calculated from the energy- time uncertainty principle. Estimate the lifetime from the full width at half-maximum of the mass measurement distribution shown. 25 MA Le 1000 1100 1200 1300 1400 1500 Mass of the delta particle M/ Number of mass me amare in each bin2. State any three conservation laws that restrict a reaction from happening in particle physics and explain how they restrict reactions.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?
- 9. Which of the following reactions and decays are possible? For those forbidden, explain what laws are violated? (а) п- +р+п + п?. (b) a+ +p → n+ 7º. (c) n+ +p→p+ e+. (d) p→ e+ + ve. (e) p→n + e+ + Ve- 10. Draw the two Feynman diagrams for electron-electron scattering at the first-order. Draw three distinct second-order diagrams.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¯.The reaction below describes an antiquark decaying into other particles. The X represents an unknown particle. d → ū + e + X a. What must be the charge of X? b. What must be the baryon number of X? c. What must be the lepton number of X? d. What is particle X?
- Watch Th X T Take Test X Answerec x momentu X joules to X Convert j X| frequenc x tps://learning.ulster.ac.uk/webapps/assessment/take/launch.jsp?course_assessment_id%=_88723_1&course_id3_324733 1&new_attem QUESTION 1 code: 002 Answer the following questions about the hydrogen atom e. v the energy of the ground state |the energy required for electron to jump from ground state to excited state, n=3 |the energy required to ionise an electron v the value in Joules of 1 electron-volt (eV) a. 13.6 eV b.3.4 eV C. 12.09 eV d. 13 6 eV e. -3.4 eV f -12.09 eV g. 1.6E-19J QUESTION 2 code: 003, A electron is in excited state n = 5. How many different ways can it return to the ground state? O a.8 O b.7 OC5 Od 4 Oe 3 QUESTION 34. - 5. Repeat the pion decay calculation for a pure scalar interaction and show that the predicted ratio of decay rates is 2 5.5. T(7- → µ-Vµ)help w modern physics