1905toPresent

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  1. Neils Bohr and fixed electron orbits
    1. Explains Emission Spectra and Absorption Spectra via electron quantum leaps.
    2. See pages 10-11 in the packet.
      1. Planetary Model
        1. Takes following fact into account which allows for electrons to stay in orbit without collapsing
      2. Discrete wavelength of light emitted by electrons jumping orbits
  2. Einstein and the
    1. If you're interested in a more detailed explanation, see Chapter 35 in Hewitt.
      1. Light appears to slow down in space sometimes. space and time must be curved by the presence of matter
  3. The Quantum Mechanical model of the atom and the roles of these scientists in the synthesis that created it:
    1. Count Louis
      1. Electrons act doubly as waves along with particles
    2. Werner Heisenberg- What is the Uncertainty Principle?
      1. Can never pinpoint location of electron, just have an area of high probability
    3. Erwin Schröedinger- What is an electron cloud?
      1. The waves must not cancel each other out in order to exist and not cancel each other out
  4. Explain why electron orbits are constrained to very specific energy levels around the nucleus.
    1. What is an Electron Wave State?
      1. Electrons only exist as self-reinforcing waves
  5. Explain the relationship between Emission Spectra and quantum leaps of an electron.
    1. What is an Absorption Spectra and why is it useful to astronomers?
      1. quantum leaps cause change in emission spectra
      2. different energy tier=different color spectra
  6. Edwin Hubble & the discovery of the expanding universe (see Creation Of Matter).
    1. Finds that there are other stars and other galaxies etc.
  7. Modern silicon computers using semiconductors.
    1. Jack Kilby
      1. TI
    2. Eugene McDermott and Cecil Green
      1. TI