L05S07_Lightparticles_photons 01-26-07

L05S07_Lightparticles_photons 01-26-07 - Chem 1A, L5:...

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Unformatted text preview: Chem 1A, L5: "Light: Intensity, Particles, Photons" Light as a Wave Electromagnetic Radiation Diffraction and Interference :wavelength A A+B B Intensity ~ Probability Distribution Summary c c :speed :frequency = c = 400 nm = 700 nm A.Pines,M.Kubinec,UCB c= 3.0 x 108 m/s L6-4 A.Pines,M.Kubinec,UCB L6-6 Electromagnetic Spectrum 400 500 Visible -rays x-rays UV IR MW Radio, NMR, MRI Absorption and Continuous Emission 600 700 nm 10-16 10-12 10-8 10-4 100 104 108 m L6-5 A.Pines,M.Kubinec,UCB Line A.Pines,M.Kubinec,UCB 2004 Pines,Kubinec, Nitsche, UCB L4-1 L6-10 Electromagnetic Spectrum 400 500 Visible -rays x-rays UV IR MW Radio, NMR, MRI 600 700 nm 10-16 10-12 10-8 10-4 100 104 108 m 2004 Pines,Kubinec, Nitsche, UCB L4-2 Constructive and destructive interference of waves 2004 Pines,Kubinec, Nitsche, UCB L4-3 A.Pines, M.Kubinec, H.Nitsche, UCB 1 Chem 1A, L5: "Light: Intensity, Particles, Photons" Electromagnetic Spectrum 400 The Particle Nature of Light Light Intensity Summary Visible x-rays UV IR MW 500 600 700 nm -rays Radio, NMR, MRI 10-16 10-12 10-8 A.Pines,M.Kubinec,UCB 10-4 100 104 108 m L7-4 2002 A.Pines,M.Kubinec, UC Ephoton = h L8-6 Photoelectric Effect The Particle Nature of Light Light-Wave / Particle LightDuality Wave (length) I II e Ekin Particle (Momentum) c Wave h = p Duality p=mc Particle p= h Ephoton = h Ekin= h - = h - ho h L7-2 A.Pines,M.Kubinec,UCB 2004 Pines,Kubinec, Nitsche, UCB A.Pines,M.Kubinec,UCB L4-4 L7-6 Profile of radiation emitted from a blackbody E = nh nh n=1,2,..,n Plank's Plank' Constant: h= 6.63 x 10-34 Js 2004 Pines,Kubinec, Nitsche, UCB L4-5 Intensity of light emerging from two columns Io 2 I0 4 L4-6 Io Io 2004 Pines,Kubinec, Nitsche, UCB A.Pines, M.Kubinec, H.Nitsche, UCB 2 Chem 1A, L5: "Light: Intensity, Particles, Photons" Light Intensity The Particle Nature of Light Ephoton = h 2004 Pines,Kubinec, Nitsche, UCB L4-7 Photoelectric Effect The Particle Nature of Light e- Ekin I o II Ephoton = h 2004 Pines,Kubinec, Nitsche, UCB Ekin= h - = h - ho L4-8 Chem Quiz 5.1 Shining a beam of light on a certain metal has no effect. What change would effect. be most likely to eject electrons? electrons? 1) Increase I 2004 Pines,Kubinec, Nitsche, UCB 2) Decrease 3) Increase E L4-9 A.Pines, M.Kubinec, H.Nitsche, UCB 3 Chem 1A, L5: "Light: Intensity, Particles, Photons" Chem Quiz 5.2 Which combination of Ekin a photon striking a metal ejects an electron with the highest KE ? 1) Yellow/I Yellow/I 2004 Pines,Kubinec, Nitsche, UCB I h h II h 2) Green/I 3) Blue/II Green/I Blue/II L4-11 Wave / Particle Duality Wave (length) Particle (Momentum) Light c Wave h = p 2004 Pines,Kubinec, Nitsche, UCB p Particle Duality p= h L4-13 Chem Quiz 5.3 A photon at 400 nm splits into two. One two. at 1200 nm, the other at . What is (nm)? 1) 200 2004 Pines,Kubinec, Nitsche, UCB 400 nm 1200 nm 2) 600 3) 800 L4-14 A.Pines, M.Kubinec, H.Nitsche, UCB 4 Chem 1A, L5: "Light: Intensity, Particles, Photons" Lecture Complete 2004 Pines,Kubinec, Nitsche, UCB L4-16 A.Pines, M.Kubinec, H.Nitsche, UCB 5 ...
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