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28.3

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Transcript

  • 1. 28.3 Fission and Fusion
  • 2. Fission
    • Fission is the splitting of nuclei into smaller nuclei
    • U-235 and Pu- 239 are examples
    • In the process, a tiny amount of mass is converted to energy-
    E=mc 2
  • 3. Figure 19.4: Unstable nucleus.
  • 4. Fission
    • Notice for every one atom split 3 neutrons are released, which can split 3 more nuclei- this is called a chain reaction
  • 5. Representation of a fission process.
  • 6. Fission
    • An atomic bomb is an uncontrolled fission reaction
    • A nuclear power plant has a controlled fission reaction- how is it controlled?
    • Well, the neutrons are absorbed so that the chain reaction is carefully regulated; and neutrons are slowed down so that they will react with the fissionable material ( usually U-235)
  • 7. Reactor
    • Moderator
    • Control rods
    • Coolant
    • Turbine
  • 8. Diagram of a nuclear power plant.
  • 9. Schematic of the reactor core.
  • 10. Fusion
    • Fusion is the combining of light nuclei into a heavier nuclei
    • 4 1 1 H +2 -1 0 e ------- 4 2 He + energy
    • Energy comes from missing mass converted into energy ( E=mc 2 )
    • Fusion releases much more energy than fission- but needs very high temp to get started
  • 11. Fusion
    • Occurs in the sun
    • On earth- in labs where matter can exist as plasma- not at point where reactors have been made.
  • 12.