phys3313-lec4 - Physics 3313 - Lecture 4 Wednesday...

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Physics 3313 - Lecture 4 9/2/2009 1 3313 Andrew Brandt Wednesday September 2, 2009 Dr. Andrew Brandt 1. Forgot to work Ex. 1.5 2. Finish Ch. 1 3. HW 1 still due 09/09/09 4. Quiz on Ch. 1 5. Particle Properties of Waves 6. Photoelectric Effect
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Units Use W=qV to define electron volt (eV) a useful energy unit 1 eV = 1.6x10 -19 C x 1V = 1.6x10 -19 J Binding energy of hydrogen atom is 13.6 eV Uranium atom releases about 200 MeV when it splits in two (fission) (not a lot of Joules/fission, but there are a lot of atoms around…) Rest mass of proton (m p ) is 0.938 GeV/c 2 which is a fine unit for mass Units of momentum, p, MeV/c 8/31/2009 3313 Andrew Brandt 2
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v pc cE = Relativistic Energy Problems 2 vE mvc γ = 2 E mc = 2 vE pc = From we can multiply by v to obtain simplifying gives which gives us a useful relation: An electron and a proton are accelerated through 10 MV, find p, v, and γ of each (work problem on blackboard) Electron: Proton: 2 22 2 2 2 ( ) (10.51) (0.511) 10.50 10.5 1 10.50 0.999 10.51 e e pc E mc MeV MeV p c KE mc v pc = −= = = = + = = = 2 (948) (938) 137.4 10 1 1 1.01 938 137.4 0.145 948.3 k p pc MeV E v pc = = + = += = = =
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Speed of Person Revisited http://www.youtube.com/watch?v=HofoK_QQxGc 8/31/2009 3313 Andrew Brandt 4
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Chapter 2 Particle Properties of Waves Classically we perceive particles and waves as different objects Particles: baseball, dust, electrons have properties such as charge,
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phys3313-lec4 - Physics 3313 - Lecture 4 Wednesday...

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