phys3313-lec5 - Physics 3313 - Lecture 5 Wednesday...

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Physics 3313 - Lecture 5 9/9/2009 1 3313 Andrew Brandt Wednesday September 9, 2009 Dr. Andrew Brandt 1. HW1 Due HW2 Assigned (9/16) 2. Faculty Research Expo Weds 4pm Thurs 3:30 SH101 (extra credit) 3. What is Light? 4. X-Rays 5. Compton Effect 6. Pair Production
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What is Light? Both wave and particle theory needed. Quantum theory: light has individual photons… but frequency is a wave phenomenon Two different interpretations of intensity Wave theory average magnitude of EM wave over a complete cycle Photon description I=Nh υ Both descriptions must give the same intensity if they are valid so Consider double slit experiment: for large N observer looking at screen would see a double slit interference pattern (continuous distribution) However, for small N, see a flash of light as one photon at a time goes through either slit (quantum phenomena), but if you wait a long time you would see an interference pattern How can photon interfere with itself ? (sounds vaguely immoral) 9/9/2009 3313 Andrew Brandt 2 2 0 I cE ε = 2 NE
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What is Light (2)? Must conclude that is the probability of finding a photon at a certain
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This note was uploaded on 10/21/2009 for the course PHYS PHYS 3313 taught by Professor Andrewbrandt during the Fall '09 term at UT Arlington.

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phys3313-lec5 - Physics 3313 - Lecture 5 Wednesday...

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