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Lecture_08 - Lecture 8 Jan 27 Quantization m “"...

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Unformatted text preview: Lecture 8 - Jan. 27 - Quantization . m “" mmfififi mamflm , mmmfifmwmmfi? m m: mmmzmtm * _ r {gimme mammmma w s‘ % http://www.noao.edu/image__gaIIery/htmI/im0600.htm| (C) Pyrex glass envempe Electron beam Filament Tungsten target - Rbntgen, 1895 0 1St Nobel Prize in Physics (1901) ©2008 by WlL Freen‘mn and .bmpany ©2008 }: “CH. Freeman arid (_ ompany X-rays electron beam Me’fal Target M m, , a WWWMWWW M Ke = 80 keV i ES 5%! ‘ hc [1V 2 7L— : Kl. — Kf hc 1min = 15.6 pm hvmax : _ : K1 & 2min 6 X—ray Crystal Diffraction ©2008 by Wli Erccn'lan and (, mmpam' Photographic piate with Laue spots 0 von Laue (1912) o Noble Prize (1914) ©2008 by \4\.»"H. ,IFH"C<_?1‘115U‘1 and ( ompany X—ray: Bragg’s Law 2dsin9=mg 0 Father/son team: William Henry and William Lawrence Bragg (Braggs’ Law?) - Nobel Prize in Physics (1915) ©2008 by l/VH. Freeman and bmpamf Photo-Electric Effect Photoelectric Effect . O O n : 0 Current does not depend on light intensity - Depend on the wavelength of light - Photon has energy E=hf=hc/A where h is .. -. .. Planck’s constant (wave-particle duality) photon =wave particle of light - To release an electron from a metal plate E(photon)> threshold energy Photoelectric Effect Photoelectric Effect 12 2) on H Frequency of incident light f (1014 flenc freq 0. . 9d 2 a imef EBCBOQ mqamofi t MW u” E .nlu .U C b e O t O In D: Work Function WC : minimum energy required to remove a single electron from a piece of metal I -~ W” 2ft“ w L. 5 {- hf > WC electron emitted hf < WC electron cannot escape [{Edcmm I [If - hf; : [If —— “7-”; ©2008 by WH. Freeman and L ompam' Element N a C Cd Al Ag Pt Mg Ni Se Pb Tabio Photoelectric work functions Work function (eV) Example ! i A beam of white light Ejected . . . photoelectron containing frequencues between 4.00x1014 Hz to 7.9Ox1014 Hz is A incident on a sodium surface V, which has a work function of 2.28 eV. Find the maximum kinetic energy of the photoelectrons ejected from this surface. Example , = 2. el/ Incoming beam ’\/\f‘-—> ’Y of whlte 11ght V2 3 5.7:! '0 l A beam of white light EjeCtEd 1% i . . . photoelectron containing frequencnes between 4.00x10-l4 Hz to 7.9Ox10-l4 Hz is 1 incident on a sod i u m su rface which has a work function of 2.28 eV. What is the range of frequencies in this beam of light for which electrons are ejected? 16 ...
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