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P1Y Quantum Phenomena Question Revision • Atomic – Question sheet 1-7, 6 • Particle Physics – Question sheet 8-12, 11 • Cosmology – Question sheet 13-16, 15 • Last May’s exam: • Anti-Hydrogen (atomic + particle physics) • b anti-b quark production at LEP Exam hints • Answer five questions – Twenty five minutes per question – If you attempt more than five, indicate your best five • Including one from each section – Extra section for P1Y* candidates • So, you must answer either one or two from quantum section. • Choose your questions carefully – Spend 5 minutes reading through – Look at the mark allocation for each bit of the question. – Don’t waste time • e.g. last years’ paper had a question which required a graph. • Some students clearly wasted time drawing perfect graphs. • The plotting of the graph, line, and axis labelling was only worth 2 marks Marking • No negative marking – In practice we will mark all questions you’ve done and give you the best mark we can! – We also mark work you crossed out, as long as we can still read it! • Explain what you are doing. – E.g. spectroscopic notation for Argon – (1s22s22p63s23p6) [3] If you write down • fill electron levels in order • Fill all n,l,m states l<n m=-l,…,+l You’d get 1.5 • Make your working/ rough work readable • If your numerical answer is physically unrealistic say that you realised this. May 2003 Cold Anti-Hydrogen was produced for the first time at CERN in 2002. (i) What is anti-hydrogen and what fundamental particles does it consist of ? {4} (ii) An anti-hydrogen atom is in an excited state with an energy 13.6 eV 2 4 Describe the quantum numbers of the atom and list the possible atomic states. {6} (iii) An anti-hydrogen atom hits the wall of a vessel containing it. We observe several pions and a few ns later two photons. Describe what happened, estimating the sum of the energy of all the observed particles. {6} [proton/neutron mass 940 MeV, electron mass 0.5MeV ] May 2003 An electron-positron collider is operated with beam energies of 45.5 GeV each. (i) Draw the lowest order electromagnetic and weak interaction Feynman diagrams for production of a b anti-b quark pair in this collider. {4} (ii) Calculate how far does a b quark travels before decaying. {4} (iii) Draw one example Feynman diagram for the decay of the b quark. {3} (iv) Describe what is observed in the particle physics detector {5} [mass of b quark 5GeV, lifetime 1.5ps]