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The Atomic Bomb

The Atomic Bomb. United States believed Hitler was developing an Atomic bomb. Manhattan Project. U.S. program to develop an Atomic Weapon Chief Scientist Robert P. Oppenheimer President Truman didn’t learn about program until he became President

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The Atomic Bomb

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  1. The Atomic Bomb

  2. United States believed Hitler was developing an Atomic bomb

  3. Manhattan Project • U.S. program to develop an Atomic Weapon • Chief Scientist Robert P. Oppenheimer • President Truman didn’t learn about program until he became President • 1st Atomic bomb was tested on July 16th 1945

  4. The Manhattan Project cont… • U.S. feared that an invasion of Japan would result in 200,000 American casualties – and perhaps 1-2 million Japanese casualties • U.S. considers using an “Atomic Bomb” to end the war quickly • Bomb had been developed as part of the “Manhattan Project” – beginning in 1942

  5. How to use the Atomic Bomb • Drop a bomb on and island in the Pacific to scare the Japanese into surrendering • Drop the Atomic bomb on Japanese cities

  6. United States Warns Japan • Truman told Japan they could expect a “Rain of ruin from the air” No response from Japan

  7. Fat Man & Little Boy

  8. Targets • Hiroshima: 365,000 People • Bombed dropped on August 6th , 1945 at 8:16am • Enola Gay

  9. Atomic Cloud Over Hiroshima

  10. Hiroshima • Ground temp: 7,000 degrees • Winds: 980mph • Buildings destroyed: 62,000 • Killed immediately: 70,000 • Dead by end of 1945: 140,000 • Area of total vaporization from the atomic bomb blast measured one half mile in diameter

  11. Before and After

  12. Nagasaki • 200,000 residents • Dropped on August 9th, 1945

  13. Nagasaki • 40,000 died on day of the attack

  14. Battle of Okinawa showed how determined Japan was to continue fighting Japanese had strong personal honor; many followed Samurai Code Invasion would mean 500,000 to 1,000,000 U.S. Deaths and maybe 2 – 4 million Japanese Intentionally targeting civilians was considered a war crime 110,000 civilians killed in the two bombings – 200,000 dead when Radiation poisoning deaths are added Truman was ‘out of the loop’ as Vice President – didn’t know destructiveness of bomb? Use the Bomb Not Use the Bomb

  15. Japan surrenders on September 2, 1945 • Long term effects of radiation caused cancer

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