L04S09_Light_particles_photons+01-27-10 (1)

L04S09_Light_particles_photons+01-27-10 (1) - Chem 1A, L4:...

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Unformatted text preview: Chem 1A, L4: "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 700 400 = 400 nm = 700 nm © A.Pines,M.Kubinec,UCB :frequency = c c= 3.0 x 108 m/s 3.0 L6-4 © A.Pines,M.Kubinec,UCB L6-6 Electromagnetic Spectrum 400 500 Visible γ-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 ©2010 Pines,Kubinec, Nitsche, UCB L4-1 L6-10 Electromagnetic Spectrum 400 500 Visible γ-rays x-rays UV IR MW Radio, NMR, MRI 600 700 nm 10-16 10-12 10-8 10-4 100 104 108 m ©2010 Pines,Kubinec, Nitsche, UCB L4-2 Absorption and Continuous Emission Line ©2010 Pines,Kubinec, Nitsche, UCB L4-3 © A.Pines, M.Kubinec, H.Nitsche, UCB 1 Chem 1A, L4: "Light: Intensity, Particles, Photons" ChemQuiz© 4.1 Glass is transparent. transparent. Which one is its absorption its absorption spectrum spectrum ? A) I ©2010 Pines,Kubinec, Nitsche, UCB I II III UV VIS IR B) II C) III L4-4 Electromagnetic Spectrum 400 500 Visible 600 700 nm Light Intensity The Particle Nature of Light The Summary γ-rays x-rays UV IR MW 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 The Light-Wave / Particle LightDuality Wave (length) I II eΦ Ekin Particle (Momentum) c Wave h = p Duality p=mc Particle p= h Ephoton = h © A.Pines,M.Kubinec,UCB Ekin= h - Φ = h - ho L7-2 ©2010 Pines,Kubinec, Nitsche, UCB © A.Pines,M.Kubinec,UCB L4-6 L7-6 Profile of radiation emitted from a blackbody ΔE = nhν n=1,2,..,n Plank’s Constant: h= 6.63 x Js 10-34 Js ©2010 Pines,Kubinec, Nitsche, UCB L4-7 © A.Pines, M.Kubinec, H.Nitsche, UCB 2 Chem 1A, L4: "Light: Intensity, Particles, Photons" Intensity of light emerging from two columns Io 2 I0 4 L4-8 Io Io ©2010 Pines,Kubinec, Nitsche, UCB Light Intensity The The Particle Nature of Light Ephoton = h ©2010 Pines,Kubinec, Nitsche, UCB L4-9 Photoelectric Effect The Particle Nature of Light e- Ekin Φ I o II Ephoton = h ©2010 Pines,Kubinec, Nitsche, UCB Ekin= hν - Φ = h - ho L4-10 © A.Pines, M.Kubinec, H.Nitsche, UCB 3 Chem 1A, L4: "Light: Intensity, Particles, Photons" Chem Quiz© 4.2 Shining a beam of light on a certain metal has no effect. effect. What change would be most likely to eject electrons? electrons? A) Increase I Increase ©2010 Pines,Kubinec, Nitsche, UCB B) Decrease C) Increase E Decrease Increase L4-11 Chem Quiz© 4.3 Which combination of Ekin a photon striking a metal ejects an electron with the highest KE ? A) Yellow/I Yellow/I ©2010 Pines,Kubinec, Nitsche, UCB I hν hν II hν C) Blue/II Blue/II L4-13 B) Green/I Green/I Wave (length) Wave / Particle Duality (de Broglie relation) Particle (Momentum) Light c Wave h = p ©2010 Pines,Kubinec, Nitsche, UCB p Particle Duality p= h L4-15 © A.Pines, M.Kubinec, H.Nitsche, UCB 4 Chem 1A, L4: "Light: Intensity, Particles, Photons" Chem Quiz© 4.4 A photon at 400 nm splits into two. One two. at 1200 at 1200 nm, the the other other at . What is (nm)? A) 200 ©2010 Pines,Kubinec, Nitsche, UCB 400 nm 1200 nm B) 600 C) 800 L4-16 Lecture Complete ©2010 Pines,Kubinec, Nitsche, UCB L4-18 © A.Pines, M.Kubinec, H.Nitsche, UCB 5 ...
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