lecture23 - Physics 102 Lecture 23 De Broglie Waves...

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De Broglie Waves, Uncertainty, and Atoms Physics 102: Lecture 23
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Hour Exam 3 Monday, Apr 19 Covers Lectures through Lecture 21 (no single-slit diffraction!) Homework through HW 10 Discussions through Disc 10 Review session Sunday, Apr 18 Sunday, Apr 18, 3pm, 141 Loomis Will cover Fall ’09 exam 3
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Photoelectric Effect Summary Each metal has “Work Function” (W 0 ) which is the minimum energy needed to free electron from atom. Light comes in packets called Photons E = h f h= 6.626 X 10 -34 Joule sec Maximum kinetic energy of released electrons – K.E. = hf – W 0 30
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Photoelectric Effect Summary Maximum kinetic energy of released electrons – K.E. = hf – W 0 30 hf W 0 KE
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Experiment: Outgoing photon has longer wavelength λ Recoil electron carries some momentum and KE Incoming photon has momentum, p, and wavelength λ This experiment really shows photon momentum! Electron at rest Compton Scattering P incoming photon + 0 = P outgoing photon + P electron λ hc hf E = = λ h p = 5 Energy of a photon Momentum of a photon
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Compton Scattering Incident photon loses momentum, since it transfers momentum to the electron Lower momentum means longer wavelength This is proof that a photon has momentum λ h p =
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Is Light a Wave or a Particle? Wave Electric and Magnetic fields act like waves Superposition, Interference, and Diffraction Particle Photons Collision with electrons in photo-electric effect Compton scattering from electrons BOTH Particle AND Wave
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ACT: Photon Collisions Photons with equal energy and momentum hit both sides of the plate. The photon from the left sticks to the plate, the photon from the right bounces off the plate. What is the direction of the net impulse on the plate?
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