lecture5_light_rel_08b

lecture5_light_rel_08b - Announcement Exams March 4 April 8...

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05/11/09 Physics 6 - Spring 08 - G.R. Goldstein 1 Announcement Exams March 4 April 8 Final May 2
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05/11/09 Physics 6 - Spring 08 - G.R. Goldstein 2 Electromagnetic waves T. Young (1801) showed that light behaves like a wave - it undergoes interference Mechanical waves - water, sound, vibrating strings and solids - are disturbances of a medium that propagate due to elasticity of the medium If light is a wave, what is waving? Maxwell (~1860) theorized that light is an EM wave (prediction from unifying E&M) Crucial concept (Faraday): Field Examples: weather map; gravity; electric force
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05/11/09 Physics 6 - Spring 08 - G.R. Goldstein 3 Temperature Field
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05/11/09 Physics 6 - Spring 08 - G.R. Goldstein 4 Wind Field
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05/11/09 Physics 6 - Spring 08 - G.R. Goldstein 5 Lecture 3 - EM field - wave 1 E field is stationary in some inertial frame S e.g. at a distance from large fixed charge See External Links for animated EM wave (http://www.phy.ntnu.edu.tw/ntnujava/viewtopic.php?t=52) E E
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05/11/09 Physics 6 - Spring 08 - G.R. Goldstein 6 E E EM field wave 2 B Ampere’s Law modified by Maxwell E/ t ~ B x xxxx x E Faraday’s Law B/ t ~ - E Lenz’s Law negative feedback or restoring force Fields themselves are like an elastic medium E B x xxxx x
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05/11/09 Physics 6 - Spring 08 - G.R. Goldstein 7 EM field wave c depends on “restoring force” and “inertia” of stationary fields E (electric force field) and B (magnetic force field) are perpendicular
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This note was uploaded on 03/29/2008 for the course PHY 006 taught by Professor Goldstein during the Spring '08 term at Tufts.

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lecture5_light_rel_08b - Announcement Exams March 4 April 8...

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