1Welcome to Phys 208!•Duration: 4 Sep-Dec 15 15 Weeks•Lectures: Tu, Th 12:05-12:55 pm•Room: 2103 Chamberlin •Honor lectures: Fri 12:05-12:55 Course Web page:http://www.physics.wisc.edu/undergrads/courses/208-f07/index.html Your ProfsMark Rzchowski ! [email protected]: 5114 Chamberlin Hall Tel.: 265-2876 Office Hrs: Wed 1-2:30 pm Research: Condensed Matter PhysicsTeresa Montaruli [email protected] Office: 4112 Chamberlin Hall Tel.: 890-0901 Office Hrs: Mon 2-3:30 pm Research: Research: High Energy Particle Physics and Astrophysics IceCube Project http://icecube.wisc.edu/~tmontaruli 3Your [email protected]! Amanda Gault [email protected]! Peter [email protected]! Saurabh [email protected]! Siyuan ZhangMeet them at the first discussion on Wed 5!Labs start on Week 2Check consultation hrs in http://www.physics.wisc.edu/undergrads/courses/208-f07/consult.htm4GradingPart of the course workWeight for your final gradeCommentsLabs10% (-30% if 1 lost)9/10 required to pass the courseDISC+Quizzes10%There will be one short (~15 min) quiz in discussion section each week, usually on Monday, and one group problem. Both will cover materials from the previous week's lecture. HW10%Mastering PhysicsExams:MTE1MTE2MTE3Final15%15%15%25%Wed., Oct 3, 1:30 hrsWed., Oct. 31, 1:30 hrsWed., Nov. 28, 1:30 hrsFri., Dec. 21, 7:45 am, 2:00 hrs exams are the main determining factor in the grade (70%)!!!5More on Labshttp://www.physics.wisc.edu/undergrads/courses/208-f07/labs.htmfor each lab you need to fill out and hand in at the end of each lab a question sheet made available to you on this page. 9/10 Labs need to be completed to pass the course!!If you complete only nine of them, the entire lab portion of your grade will be reduced by 30%You can agree with your TA to make up labs with a good excuse (make-up week when exams scheduled and there are no labs)TextBook and HWshttp://www.masteringphysics.com/08/17/2007 04:36 PMMasteringPhysics: Knight, Physics for Scientists and Engineers, 1ePage 1 of 1http://session.masteringphysics.com/myct?productID=knight1ALERT: Login and registration services for MasteringPhysics will be down for a brief scheduled maintenance period onSaturday, August 18th starting at 4:00am (U.S. Eastern). Login services will be restored no later than 6:00am. Registrationwill be restored no later than 9:00am.Knight, Physics for Scientists and Engineers,1eFirst-Time User?Register here with your AccessCode to establish your LoginName and Password.Want to buy access online?Click below to use your creditcard.Select a different productReturning User?If you have already registeredan account, log in here.Login NamePasswordView your account summaryForgot your Login/Password?Product Support | Purchase Subscription© 2007 Pearson Education, Inc., publishing as Addison Wesley Logging into this site confirms your acceptance of the Subscription and End- User License.•Homeworks due each Thu at 11:59pm (HW0 for practice on Sep 10, HW1 on Sep 13 midnite)Grades available online7Contents•Waves: interference & diffraction (Ch 20-22)•Optics and Image Formation (Ch 23)•Electricity and Magnetism (Ch 25-33)•Electromagnetic Waves (Ch 33-34)•Modern Physics (Ch 37-42)•Friday Honor Lectures (modern physics and physics applied to biology and other human sciences), must attend for honors. Other students optional. Start next week (K. Forest - Biological Diffraction). 8P208 Goal124 students enrolled, mostly Bachelor of Science, Natural Sciences, Bachelor of Arts Will continue mainly in Biological Sciences, Agriculture, Math, Physics, Medicine, EngineeringP208 focuses on connections between Physics and other Life SciencesUse physics methods to understand processes happening in Humans and Nature!9Waves (From P207)Wave is a disturbance that propagates through a medium with a velocity determined by itEnergy and momentum propagate, not massMechanical waves: propagate in a medium where a restoring force acts (tension in a stretched string, gravitation on waves in a lake). Eg. Sound waves propagate in airElectromagnetic waves: oscillating electric and magnetic fields (no need of a material medium)Matter waves: dual nature of particles like the photon (light wave and quantum of energy)10Traveling Waves A traveling wave causes particles in a medium to be displaced from their equilibrium position. D(x,t) = displacement at time t of a particle at position x = wave functionD(x,t) = D(x-vt) wave travels with speed v in the positive x-directionD(x,t) = (D(x+vt) in the negative x-directionTransverse wave: displacement of particles is perpendicular to the wave velocity (e.g. electromagnetic waves)Longitudinal wave: displacement of particles is parallel to the wave velocity (eg. sound waves in air and fluids)Sinusoidal Waves and Simple Harmonic oscillatorSinusoidal waveThe wave is periodic in space and the distance spanned T is ! = wavelength f = frequency in Hz = s-1! v ="T="fSimple Harmonic oscillatorrestoring force! "kx = md2xdt2general solutionto describe motion of m is sine wave! x(t) = A sin("t + #0)! "=kmx12Sinusoidal WavesAt t=0Wave in motioninitial phase! D(x,t = 0) = A sin 2"x#+ $0% & ' ( ) * ! D(x,t) = A sin 2"x # vt$+ %0& ' ( ) * + = A sin(kx #,t + %0)wave number! k =2"#angular frequency! "= vk =2#$v =2#TphasePhase difference for 2 waves with same frequency:! "# = #2$ #1= (kx2$%t + #20) $ (kx1$%t + #10) == k"x $ "#0=2&'"x $ "#0SOUND waves•Audible waves: within sensitivity of human ear ~20 Hz - 20 kHz•Frequencies of Infrasonic (Ultrasonic) waves < (>) audible range•The speed of mechanical waves in a medium depends on the compressibility and the density of the medium. Sound wave velocity increases with temperature: at 0°C 331 m/s, at 20°C 343 m/sm/sUltrasonography: medical imaging technique for internal organs, used to visualize fetus. Oscillators vibrating at MHz produce sound waves with speedsin water (main component of human body) corresponding to !~0.5 mm suitable for small objectsLight waves Electromagnetic waves are oscillations of E-fields and B-fields traveling at speed of light in vacuum ~3x108 m/sLight slows down in a transparent medium v = c/n n = index of refraction > 1when light travels from one medium to another v changes but ONLY ! doeswhen light generates compression at the
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