Hiroshima and Nagasaki
By Jenny, Jessica and Susannah
3 Big Ideas
1.Manhattan Project
2.Significance of Bombing
3.Why?
Code Name: Manhattan
Project
• Einstein: Dear President Roosevelt
• Scientists:
o
o
o
o
Oppenheimer
Bohm
Fermi
Szilard
• Research: Oak Ridge
• 1st test: July 6, 1945
Test Weapons
• "Little boy": Uranium- 235
• "Fat man": Plutonium- 239
The atomic bombing
• August 6, 1945: Hiroshima
• August 9, 1945: Nagasaki
In response
to
• Pearl Harbor
• preemptive
attacks
Surrendered
• After radioactive fallout
• Hirohito, Emperor
Little Boy
• 9,700 pounds
• directly killed 194,566,000 people
• destructive force 63 Tera-Joules
Nuclear Fission
• The atom splits
• critical mass- fissionable materials needed
Fissionable Materials
• start with U-235, U-233, Pu-239
• formed isotopes U-235= U-236= Kr-92+ Ba-142
• U-235 + 1 neutron= 2 neutrons + Sr-92 + Xe-140+ Energy
Nuclear Chain Reaction
• Atom bombarded with nucleus
• process continues and triples
• sustained by neutron
Nuclear Weapon
• Primarily use Plutonium, Uranium
• USA, United Kingdom, France, China, Russia
N.P.T
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