Fat man and little boy bomb

The Unknown Beginnings of Fat Man and Little Boy

fat man and little boy bomb

"Fat Man" was the codename for the nuclear bomb that was detonated over the Japanese city of Nagasaki by the United States on 9 August It was the second of the only two nuclear weapons ever used in warfare, the first being Little Boy, and its detonation marked the third nuclear explosion in history.

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It was the second of the only two nuclear weapons ever used in warfare, the first being Little Boy , and its detonation marked the third nuclear explosion in history. The name Fat Man refers to the early design of the bomb because it had a wide, round shape; it was also known as the Mark III. Fat Man was an implosion-type nuclear weapon with a solid plutonium core. The first of that type to be detonated was the Gadget in the Trinity nuclear test less than a month earlier on 16 July at the Alamogordo Bombing and Gunnery Range in New Mexico. Two more were detonated during the Operation Crossroads nuclear tests at Bikini Atoll in , and some were produced between and , when it was superseded by the Mark 4 nuclear bomb. The Fat Man was retired in

August was the first — and only — time that atomic bombs were used in warfare. On Aug. Three days later, the U. The shell of an apartment building 2, feet from ground zero in Hiroshima is all that is left following the dropping of the atom bomb on this Japanese city in The United States called for the unconditional surrender of the Japanese armed forces in the Potsdam Declaration on July 26, A uranium atomic bomb called "Little Boy" was dropped on Hiroshima on Aug. The "Fat Man" plutonium bomb was dropped on Nagasaki on Aug.

For a detailed timeline of the bombings, please see Hiroshima and Nagasaki Bombing Timeline. On August 6, , the United States dropped an atomic bomb on the city of Hiroshima. The bomb was known as "Little Boy", a uranium gun-type bomb that exploded with about thirteen kilotons of force. At the time of the bombing, Hiroshima was home to ,, civilians as well as 43, soldiers. Between 90, and , people are believed to have died from the bomb in the four-month period following the explosion. The U.

The bomb was dropped at approximately (JST) 6 August It was less powerful than the Fat Man, which was.
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An explosive nuclear chain reaction occurs when a sufficient quantity of nuclear fuel, such as uranium or plutonium, is brought together to form a critical mass. This is the minimum amount of fissionable material needed to start a chain reaction. The chain reaction starts when neutrons strike the heavy uranium or plutonium nucleus which splits releasing a tremendous amount of energy along with two or more neutrons which, in turn split more nuclei, and so on. In this gun-type device, the critical mass is achieved when a uranium projectile which is sub-critical is fired through a gun barrel at a uranium target which is also sub-critical. The resulting uranium mass comprised of both projectile and target becomes critical and the chain reaction begins. Dropped on the Japanese city of Hiroshima on August 6, , it was the first nuclear weapon used in a war. The first was the "Gadget" detonated at the Trinity site on July 16,

Little Boy and Fat Man strike ‘searing, crushing atomic blast’ to Japan, August 1945

Fat Man and Little Boy, are the nicknames given to the first and only two Atomic bombs ever used in combat. - It was the first nuclear weapon used in warfare.


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