Weapons From 1920 – 1950 Atomic Bomb It was used first used during the World War II in the year 1945. It was used by the USA against Japan. It was used in two Japanese cities Nagasaki & Hiroshima. The atomic bomb was carried from a plane and it exploded when it reached the ground. The atomic bomb was, at that time the deadliest and biggest bomb. It was able to destroy an entire city. How it Works An Atomic explosion consist mainly in a chemical explosion that causes the plutonium electron's to touch the protons, causing the atoms to release high powered energy. Who created the bomb There were several people who helped create the atomic bomb. Such as Philip Morrison, Robert Oppenheimer, Einstein, and four others. The atomic bomb made the Japan people surrender. Than that was the end of World War II. YouTube http://www.youtube.com/watch?v=t1 9kvUiHvAE&feature=fvst The End