010 - The interaction betncen light and matter determines...

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Unformatted text preview: The interaction betncen light and matter determines the appearance ol‘etenthing around US \lirmr mtlet‘rs all cuter: w it took; I L 7 ./ ‘- Em: some iiitlumpm il ubsut‘m tctl nth! blue but i‘li,.,.r :thets “A but . \thlu's gun .wwrlm Jinn taint; 43) Light as an electromagnetic wave l Electric fields Arise. imn. Charges (c g. L Also ilunSl gmg magnum. fields Magnetic fields Arise [ram “‘0‘ ing charge: "'T. ‘ J , ['11-L 12g cum-tit} u -i unto ,: , \I‘ ' cll leEl Also changing clcciric lucid; 1‘“ l ' ) Ill: qumllofl: an oscillating dint 'inakes an usiilltttiny time at ciccuit and magnetic cede Electromagnetic wave: m, .m'i- .‘ iimi. ti iicids itieiin iii: Am in ation (5) Wavelength, Frequency & Speed , A Wat clcnglli, A distance from pealx to peak measured in meters Fregueneki [ : number nt'waves passing any point per second, measured in llerlz‘ Hz Wane sgeed, L = pi ngrcssimt nf‘waves across space measured in meters/sec SlHCC I waves each oflength}. pass in ] sec, then I r j x it (4) The Nature of Light: i i l i Light behaves in tuo complementary ways (a) it hchzn cs like a \\3\ e of electromagnetism This was studied by Elu\ gens. Young. 62 Maxwell (b) ll behaves like agattzde. gelled a Qhoton ‘ This “as studied b} Semen. Einstein. & Planck In quantum ph). SICS. u i: no“ knots a_ll LI“; , both waves and particles is g eectro atoms, inoleculest , ) 4b) Why do EM waves interact with matter? Malter contains Charges (electronsl, and these get pushed and pulled by the oseillttting electric field This motion may absorb 0r scailter the EM \i'at e EVfileE radio waves move electrons in an aerial ElEClHC iicld {milks L‘ch’lluH: an nmut _. Int-L Jiiti Itu‘tll [\lakctowilluilng rim it amplified and mm to ‘ rim-r to make sound drltl: E\'ul1 unlit) “AYCS are not themselves smind‘H l Example red and blue light waves resonate With eleutrons near a Mg" ion in Chlorophyll‘ on Loirl‘igttralion helps i'c- ."EJ lnnlctllicq and so cuih'crl , r , «guru Example: the frequency of. - light waves Starting W‘llh c L fx ), ‘ Simpl) rearrange f: 7 i We need A for green light, it is 500 nin (5 x 10’7 m), or 1/2‘30‘h human hair, i -) notice. c is huge and). [S tiny a f is gynormous 7 L; 3x 10" infs _‘ "'"TA ' ‘ f’ A 500x10"’m 79519.35; = 6 hundred thousand billion osctllations per secondl (slowed to l per sec takes 20 million years). ...
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