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27.7 Wave-particle Duality Experiments show light has wave properties or particle properties.

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27.7 Wave-particle Duality Experiments show light has wave properties or particle properties. - PowerPoint PPT Presentation


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27.7 Wave-particle Duality Experiments show light has wave properties or particle properties. Diffraction Interference Photoelectric effect Compton scattering Einstein → E particle = hf wave. 27.8 Wave Nature of Matter Do particles have wave properties?

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Presentation Transcript
slide1
27.7 Wave-particle Duality
    • Experiments show light has wave properties or particle properties.
      • Diffraction
      • Interference
      • Photoelectric effect
      • Compton scattering
    • Einstein → Eparticle = hfwave

APHY201

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27.8 Wave Nature of Matter
    • Do particles have wave properties?
    • De Broglie wavelength of a particle
    • Not noticed for macroscopic objects but important for microscopic objects
      • Diffraction of electrons from a crystal
      • Shown for other subatomic particles as well

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slide3

X-ray diffraction 1912

Electron diffraction 1927

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27.10 Early Models of the Atom
    • Plum-pudding model and Rutherford’s experiment

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27.10 Early Models of the Atom
    • Rutherford’s “planetary model” - the atom is mostly empty space with a small positive nucleus.

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27.11 Atomic Spectra
    • Each element has its own distinct set of spectral “lines” – like human fingerprints or UPC labels
    • Helium was discovered in the Sun (1868) before on the Earth (1882)
      • The solar spectrum has lines that were not known on the Earth at that time
    • Applications: astronomy, chemistry, forensics, …

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27.12 The Bohr Model
    • Why do atoms only emit and absorb at certain wavelengths? Why are atoms stable?
    • Assumptions of Bohr’s theory
      • 1. The e- moves in circular orbits around the nucleus
      • 2. Only certain orbits are stable
      • 3. Radiation is emitted when the e- “jumps” from a higher energy state to a lower one.
      • 4. The size of the orbits is determined by the e- orbital angular momentum.

APHY201

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