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

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

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

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

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

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

 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

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

 Example of chain reaction!  To think about: How is it similar and different from nuclear fission?  DMjcchI DMjcchI

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