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Manfra15-2011

# Manfra15-2011 - CHAPTER 5 Wave Properties of Matter and...

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5.1 X-Ray 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 (1892-1987) CHAPTER 5

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5.5: Waves or Particles? Dimming the light in Young’s two-slit 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 single-slit pattern. Each photon actually goes through both slits! Same for electrons!
Can you tell which slit the photon went through in Young’s double-slit exp’t? When you block one slit, the one-slit pattern returns. Two-slit pattern One-slit pattern At low intensities, Young’s two-slit experiment shows that light propagates as a wave and is detected as a particle.

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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 λ ph < d (the slit separation) to disting- uish the slits. Diffraction is significant only when the separation is ~ the wavelength of the wave.
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Manfra15-2011 - CHAPTER 5 Wave Properties of Matter and...

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