phys3313-lec6 - Physics 3313 - Lecture 6 Monday September...

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Physics 3313 - Lecture 6 9/14/2009 1 3313 Andrew Brandt Monday September 14, 2009 Dr. Andrew Brandt 1. Finish Ch.2 Pair Production etc. 2. HW CH 2 due weds 9/16 3. Quiz (review 1, give 2) 4. Wave Properties of Particles 5. de Broglie Waves 6. Matter Waves 7. Wave Equation
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Colloquium Weds. Sep 16 http://www.uta.edu/events/main.php?view=event&eventid=1252019205996 Kaushik De talk on origins of mass at 6 th floor library 12-1 so we will start class 15 minutes late. 10 points extra credit on quiz if you go and do a short writeup 9/14/2009 3313 Andrew Brandt 2
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Pair Production In pair production a photon of sufficient energy can create an electron/positron pair. How much energy? Charge conserved, for energy and momentum conservation need the nucleus (Ex. 2.5) Opposite of pair production is annihilation 9/9/2009 3313 Andrew Brandt 3 2 2 .511 2 e m c MeV ≥= × ee γγ +−
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9/9/2009 3313 Andrew Brandt 4 Energy Loss in Matter
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9/9/2009 3313 Andrew Brandt 5 Photons and Gravity h p c ν = h mv c = 2 hv m c = E pc h = = for v=c effective mass of photon, implies light affected by gravity Black hole—so much gravitational force that photons cannot escape
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phys3313-lec6 - Physics 3313 - Lecture 6 Monday September...

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