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Unformatted text preview: 5.1 XRay Scattering 5.2 De Broglie Waves 5.3 Electron Scattering 5.4 Wave Motion 5.5 Waves or Particles? 5.6 Uncertainty Principle 5.7 Probability, Wave Functions, and the Copenhagen Interpretation 5.8 Particle in a Box Wave Properties of Matter and Quantum Mechanics I Problems due next Monday: March 7th, Chapter 5: 7, 22, 25, 27, 28, 36, 37, 44, 48, 54 Louis de Broglie (18921987) CHAPTER 5 5.5: Waves or Particles? Dimming the light in Youngs twoslit experiment results in single photons at the screen. Since photons are particles, each can only go through one slit, so, at such low intensities, their distribution should become the singleslit pattern. Each photon actually goes through both slits! Same for electrons! Can you tell which slit the photon went through in Youngs doubleslit expt? When you block one slit, the oneslit pattern returns. Twoslit pattern Oneslit pattern At low intensities, Youngs twoslit experiment shows that light propagates as a wave and is detected as a particle. Which slit does the electron go through? Shine light on the double slit and observe with a microscope. After the electron passes through one of the slits, light bounces off it; observing the reflected light, we determine which slit the electron went through. The photon momentum is: The electron momentum is: Need ph < d (the slit separation) to disting uish the slits....
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This note was uploaded on 04/23/2011 for the course PHYS 342 taught by Professor Staff during the Spring '08 term at Purdue UniversityWest Lafayette.
 Spring '08
 Staff
 mechanics

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