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For more information, please see full course syllabus of AP Physics B
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Matter Waves

  • De Broglie hypothesis: all material particles have wave characteristics. The wavelength associated with a particle of momentum p is h / p.
  • The Uncertainty Principle: Although in classical physics there is no limit, in principle, to how accurately the position and momentum of a particle are measured, the situation is different in quantum physics, which rules the behavior of microscopic particles. Due to the wave nature of particles, the product of the uncertainties in position and momentum of a particle is equal to h /(4*pi); this is Heisenberg’s uncertainty principle.

Matter Waves

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
    • De Broglie Wavelength
    • Photon of light E=hf
    • For particles Lambda=hp
    • Davisson and Germer, Electron Diffraction
    • Double Slit, Instead of Light Shooting Electrons
    • Detecting Electrons on Flourescent Screen
    • Bright Fringes
  • Example 26:03
    • Electron Moves
    • Kinetic Energy of Electron
    • Wavelength of Baseball
    • Refraction Pattern
  • Uncertainty Principle 41:44
    • Heisenberg Uncertainty Principle
    • Sending an Electron Through a Hole
    • In Y Direction the Position is Uncertain
    • Example
    • Speed of Electron
    • Position of Electron
  • Extra Example 1: Kinetic Energy of Electrons
  • Extra Example 2: Uncertainty Principle
  • Extra Example 3: Wavelength of Electron and Photon