102 lect23_handout

102 lect23_handout - Physics 102: Lecture 23 De Broglie...

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Physics 102: Lecture 23, Slide 1 De Broglie Waves, Uncertainty, and Atoms Physics 102: Lecture 23
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Physics 102: Lecture 23, Slide 2 Three Early Indications of Problems with Classical Physics • Blackbody radiation • Photoelectric effect • Wave-particle duality Lecture 22: Quantum Mechanics • Compton scattering • DeBroglie • Heisenberg Uncertainty Principle Today
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Physics 102: Lecture 23, Slide 3 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 = = h p = Photon energy Photon momentum E = pc
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Physics 102: Lecture 23, Slide 4 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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Physics 102: Lecture 23, Slide 5 Is Light a Wave or a Particle? •W a v e – Electric and Magnetic fields act like waves – Superposition, Interference, and Diffraction • Particle – Photons – Collision with electrons in photo-electric effect – Compton scattering from electrons
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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? 1) Left
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102 lect23_handout - Physics 102: Lecture 23 De Broglie...

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