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The atomic Bomb code named The Manhattan Project was the first atomic Bomb created by the United States The United States supervised the development of the atomic bomb under the code name Manhattan Project during World War II The first sustained nuclear chain reaction was achieved in December 1942 at the University of Chicago under the direction of Arthur Holly Compton Key members of the research team were Enrico Fermi and J Robert Oppenheimer Shortly after the first bomb test was completed atomic bombs were dropped on the Japanese cities of Hiroshima Aug 6 1945 and Nagasaki Aug 9 1945 The atomic bomb which was developed secretly in the United States during World War II differed from all earlier types of bombs It contained radioactive substances that underwent very rapid changes under certain conditions releasing immense quantities of light and heat For an atom bomb to explode its radioactive ingredients an isotope of uranium called U-235 must be present in a large quantity The name of this quantity is called a critical mass The exact details of the bombs construction remain secret but it probably contains two different quantities of radioactive material that are brought together mechanically to form a critical mass and then they will explode it An atomic bomb works by means of fission a process in which unstable atoms split and eventually form stable smaller atoms The other main type of nuclear bomb is the hydrogen bomb works by fusion with small atoms combining into larger ones A hydrogen bomb which is far more powerful than an atom bomb uses isotopes of hydrogen The final reactions do not involve a critical mass and so the bomb size and energy yields are unlimited When Hiroshima was hit by the atomic bomb it all that could be seen was a noisless Flash Hiroshima was a port city at southwest end of Honshu Island founded in the 16th century as a castle
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