2.  Splitting the Nucleus  Caused by: neutron hitting nucleus  Most cases split in 2 main parts (binary fission)  Releases Energy

3.  Some Possible Products: Ba, Kr, Sr, Cs, I and Xe  Some Possible Reactions: 235 U + 1 neutron → 92 Kr + 141 Ba + 3 neutrons + ENERGY 235 U + 1 neutron → 94 Sr + 140 Xe + 2 neutrons + ENERGY

4.  Products have certain probabilities  Mass ratio of products generally around 3:2

5.  Mass of products is 0.1% LESS than mass of reactants E = m c 2  Each reaction releases around 200 MeV (3.204353×10 -11 Joules) Energy Produced In Joules Change in mass In kilograms Speed of Light Squared 90,000,000,000,000,000 meters/second

6.  Self-sustaining  Each reaction produces more neutrons  Every neutron doesn’t hit another nucleus  Need a critical mass

7.  Nuclear Bombs Uncontrolled chain reaction Release energy at once  Nuclear Energy Controlled chain reaction Release energy slowly

8.  Two types of fission bombs  First test released same energy as 20,000 tons of TNT  Aug. 6 and 9, 1945 detonated over Hiroshima and Nagasaki killing 200,000 People

9.  20% of U.S. Energy from Nuclear  10 million times the energy per reaction compared to burning coal  Radioactive Waste

11.  Example of chain reaction!  To think about: How is it similar and different from nuclear fission?  http://www.youtube.com/watch?v=noSS DMjcchI http://www.youtube.com/watch?v=noSS DMjcchI

12.  Slide 2: http://en.wikipedia.org/wiki/File:Stdef2.pnghttp://en.wikipedia.org/wiki/File:Stdef2.png  Slide 3: http://www.atomicarchive.com/Fission/Fission1.shtmlhttp://www.atomicarchive.com/Fission/Fission1.shtml  Slide 4:  http://world-nuclear.org/education/phys.htm http://world-nuclear.org/education/phys.htm  Slide 6:  http://en.wikipedia.org/wiki/File:Fission_chain_reaction.svg http://en.wikipedia.org/wiki/File:Fission_chain_reaction.svg  Slide 7: http://en.wikipedia.org/wiki/File:Nagasakibomb.jpghttp://en.wikipedia.org/wiki/File:Nagasakibomb.jpg http://insp.pnnl.gov/-reports-pocketbook-czechrep.htm  Slide 8: http://en.wikipedia.org/wiki/File:Fission_bomb_assembly_metho ds.svg http://en.wikipedia.org/wiki/File:Fission_bomb_assembly_metho ds.svg  Slide 9: http://en.wikipedia.org/wiki/File:2008_US_electricity_generation _by_source_v2.png http://en.wikipedia.org/wiki/File:2008_US_electricity_generation _by_source_v2.png  Slide 10:  http://www.cameco.com/uranium_101/uranium_science/nuclear _reactors/ http://www.cameco.com/uranium_101/uranium_science/nuclear _reactors/