Lecture 4 - Chem 4A Lecture 04: Light Waves Chem Particles...

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Unformatted text preview: Chem 4A Lecture 04: Light Waves Chem Particles Photons 9/4/2008 Electromagnetic Spectrum 400 500 Visible ν γ-rays x-rays UV IR MW Radio, NMR, MRI 600 700 nm 10-16 10-12 10-8 © 2008 A. Pines M. Kubinec 10-4 100 104 λ 108 m L4-1 Photoelectric Effect The Particle Nature of Light eΦ Ekin ν νo Ephoton = hν © 2008 A. Pines M. Kubinec Ekin= hν - Φ = hν - hνo L4-2 ChemQuiz© 4.1 © 2008 A. Pines M. Kubinec L4-3 © 2008 A. Pines M. Kubinec 1 Chem 4A Lecture 04: Light Waves Chem Particles Photons 9/4/2008 ChemQuiz 4.2 © 2008 A. Pines M. Kubinec L4-4 Light Intensity Ephoton = hν ν γ-rays 10-16 10-12 x-rays 10-8 10-4 MW Radio,TV,NMR,MRI 100 104 108 m λ Absolute Thresholds (Schiffman, Psychology) Vision: A candle on a dark clear night at 30 miles © 2008 A. Pines M. Kubinec L4-5 Diffraction and Interference Intensity A+B ~ Probability Distribution © 2008 A. Pines M. Kubinec L4-6 © 2008 A. Pines M. Kubinec 2 Chem 4A Lecture 04: Light Waves Chem Particles Photons 9/4/2008 ChemQuiz© 4.3 © 2008 A. Pines M. Kubinec L4-7 Light Wave/Particle Duality Wave (length, frequency) Particle (Momentum) λ c E = hν = hc/λ hc/ E = mc2 = pc p p = h/ λ Wave h λ= p © 2008 A. Pines M. Kubinec Particle h=6.62 x 10-34 Js Duality p= h λ L4-8 ChemQuiz© 4.4 © 2008 A. Pines M. Kubinec L4-9 © 2008 A. Pines M. Kubinec 3 ...
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