exam2review - Today Exam#2 Review Exam #2 is Thursday March...

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ISP209s7 Exam2 Review -1- Today – Exam#2 Review • Exam #2 is Thursday March 13 in this room, BPS 1410 • Extra Credit Projects: Spring Break Story Contest • The exam is 40 multiple choice questions. There are a few questions where you will have to use a formula and calculator. • Bring your student ID • You will have the full 80 minutes for the exam. • You can bring one 8.5x11 inch sheet of notes (front and back)
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ISP209s7 Exam2 Review -2- Where are we? • There are 4 known forces in nature (Gravity, weak, EM- electromagnetic , strong) • Gravity does not fit well in our understanding with the others – It is very weak compared to the others. Why? • Our current understanding of nature is by Quantum field theory: EM - quantum electrodynamics, EM+weak - electroweak theory, Strong - quantum chromodynamics). • Our understanding of force involves the exchange of force carrying bosons between particles
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ISP209s7 Exam2 Review -3- The particles of nature T. Kondo Charge +2/3 -1/3 anti-particles have opposite charge 0 -1
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ISP209s7 Exam2 Review -4- How nature is put together from the pieces… Atoms Atomic Nucleus A proton (uud) Made of nuclei and electrons. Size: 10 -9 m Made of neutrons and proton. Size 10 -14 m Made of quarks: Size 10 -15 m A neutron has ddu
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ISP209s7 Exam2 Review -5- Closer to what a proton really looks like time http://www.gwu.edu/~cns/theory/theory_webpage/proton2_qcd.jpg
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ISP209s7 Exam2 Review -6- A summary of the forces of nature Force Strength Carrier Acts on Range (m) Strong 1 Gluon, g quarks anything with charge quarks, electrons (leptons) , neutrinos anything with mass 10 -15 size of a proton Electromagnetic 1/137 photon infinite Weak 10 -6 Vector Bosons W +, W - ,Z 0 10 -18 Only 0.001 width of proton Gravity 6x10 -39 Graviton (?) infinite
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ISP209s7 Exam2 Review -7- Our Picture of Force A charge creates a field… π 4 h t E Δ Δ Virtual particles can exist for a short time. Picture of the field Feynman diagram
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ISP209s7 Exam2 Review -8- Why is the sky blue? Feynman Diagram The process is more likely if the photon energy is higher. Hence blue light scatters more than red light.
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ISP209s7 Exam2 Review -9- Coulombs Law • Charge comes in units of 1.6E-19C. • The force between two charges is:
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exam2review - Today Exam#2 Review Exam #2 is Thursday March...

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