chapter6 - Electromagnetic Spectrum Electromagnetic...

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Unformatted text preview: Electromagnetic Spectrum Electromagnetic Spectrum Light as a Wave - Recap Light as a Wave - Recap Lig ht e xhib its s e ve ra l wa ve like pro pe rtie s inc luding Refraction Refraction : Lig ht b e nds upo n pa s s ing fro m o ne s ub s ta nc e to a no the r) Dispersion Dispersion : White lig ht c a n b e s e pa ra te d into c o lo rs . Diffraction Diffraction : Lig ht s o urc e s inte ra c t to g ive b o th c o ns truc tive a nd de s truc tive inte rfe re nc e . c = c = = wavelength (m) = frequency (s-1 ) c c = speed of light (3.00 10 8 m/s) Blackbody Radiation & Max Planck Blackbody Radiation & Max Planck The c la s s ic a l la ws o f phys ic s do no t e xpla in the dis trib utio n o f lig ht e m itte d fro m ho t o b je c ts . Ma x Pla nc k s o lve d the pro b le m m a the m a tic a lly (in 1900) b y a s s um ing tha t the lig ht c a n o nly b e re le a s e d in c hunks o f a dis c re te s ize (q ua ntize d like c urre nc y o r the no te s o n a pia no ). We c a n think o f the s e c hunks a s pa rtic le s o f lig ht c a lle d photons photons . E = h E = h E = hc/ E = hc/ = wavelength (m) = frequency (s-1 ) h h = Plancks constant (6.626 10-34 J-s) Photoelectric Effect Photoelectric Effect In 1905 Albert Einstein explained the photoelectric effect using Plancks idea of quantized photons of light. He later won the Nobel Prize in physics for this work. Line Spectrum of Hydrogen Line Spectrum of Hydrogen In 1885 Jo ha nn Ba lm e r, a S wis s s c ho o lte a c he r...
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chapter6 - Electromagnetic Spectrum Electromagnetic...

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