The document summarizes the development of the atomic bomb during World War 2. It details how Einstein wrote to FDR warning that Germany may develop a nuclear weapon first and that the US started the secret Manhattan Project to build bombs. It describes the types of bombs built - Fat Man and Little Boy - and that they were dropped on Nagasaki and Hiroshima in August 1945, leading to Japan's surrender and ending the war in the Pacific.

1. The Atomic Bomb

2. Einstein-Szlard letter
• Written to FDR saying
the nuclear research
could produce a bomb.
• Worried that the
Germans might develop
before us.
• FDR planned to use the
bomb against Germany.
Nuclear research being done in
Germany at Haigerloch

4. The atomic research project was
called the Manhattan project.

5. Nuclear testing was done at Los
Alamos Laboratory (Project Y)

6. Robert Oppenheimer President Franklin D. Roosevelt

7. Ranch School Buildings

8. To build the bomb...
They needed a team of:
• Physicists
• Chemists
• Metallurgists
• Explosive experts
• Military personnel

9. FDR dies... Truman becomes president

10. There were 2 kinds of bombs build
• FAT MAN • LITTLE BOY
• Implosion fission • Gun-type fission
• Plutonium core • Uranium
• Nagasaki • Hiroshima
• Aug 9th 1945 • Aug 6th 1945

11. Fat
Man

12. Little Boy

13. Truman was pressured into using the bomb.

14. Bockscar & Enola Gay

15. Nagasaki Hiroshima

16. Nagasaki Hiroshima

17. After the war, Truman signed the
Atomic Energy Act of 1946