1. Manhattan Project
Nuclear Bombs

2. Conception
America feared an invasion of Japan would cost too many lives
Manhattan Project (1942): Research and Development program for Atomic Bomb
-named after Manhattan, New York
Began in 1939
Albert Einstein
-fled Nazi Germany to the U.S.
-wrote a letter to FDR urging him to explore nuclear weaponry in 1939
Research team led by Robert J. Oppenheimer
President Harry S. Truman (Roosevelt Died in April of 1945)

4. Atomic Bomb Made of plutonium and uranium Nuclear fission
Plutonium -239 main ingredient
Test explosion in New Mexico

5. Potsdam Declaration July 26th, 1945
Called for Unconditional Surrender of Japan
President Harry S. Truman, Great Britain, and China
If Japan does not surrender, the would face “Prompt and Utter Destruction”.
Japan did not tell it’s people
However, U.S. Bombers dropped leaflets
Japan ignored the call for a surrender…

6. Hiroshima August 6th, 1945 “Enola Gay” B-29 Bomber
Bomb named “Little Boy”

7. Destruction Explosion equivalent to 15,000 tons of TNT
Destroyed every building within a mile radius of ground zero
Massive firestorm
75,000 people instantly killed
100,000 total by the end of 1945
Radiation effects

8. Hiroshima Video
10s

11. Nagasaki No response from Japan after 1st bomb August 9th, 1945
“Fat Man” bomb dropped
40,000 instantly killed

12. Hiroshima and Nagasaki

13. Japan Surrenders Japan officially surrenders on August 14th, 1945
-Victory over Japan Day
September 2nd, 1945
-Japan leaders meet with General Douglas MacArthur aboard the U.S.S. Missouri to sign surrender

15. Japan’s Surrender

16. Effects of Atomic Bomb

18. Review
What was the name of the project set up to develop the atomic bomb?
Who warned President Roosevelt to pursue the use of nuclear fission to develop a bomb?
What was the 1st drop site of the atomic bomb?
What was the 2nd drop site?
What were the names given to the bombs?
When was Victory over Japan Day?
What US ship did Japan sign their surrender aboard?