Difference between revisions of "Atomic bomb"

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The secret wartime project that developed the bomb was called by the code name ''the Manhattan project.'' Much of the development took place at Los Alamos, New Mexico. The laboratories built there for the Manhattan Project became what is today the Los Alamos National Laboratory.
 
The secret wartime project that developed the bomb was called by the code name ''the Manhattan project.'' Much of the development took place at Los Alamos, New Mexico. The laboratories built there for the Manhattan Project became what is today the Los Alamos National Laboratory.
  
The United States dropped two atomic bombs named [[Little Boy]] and [[Fat Man]] on the Japanese cities of [[Hiroshima]] and [[Nagasaki]] respectively, bringing the war between the US and Japan to a swift and decisive end. The morality of the use of the bombs is debated because of a fear of atomic technology, and because of the huge loss of civilian life (140,000 at Hiroshima, 70,000 at Nagasaki). U. S. officials have said that the cities as a whole were proper military targets, and that because the bombings ended the war so quickly, fewer Japanese civilians were killed than if the bombs had not been used. It was only after the bombing of Hiroshima did the U.S. drop pamphlets predicting a similar fate for more Japanese cities in the absence of immediate acceptance of the terms of the Potsdam agreement. By 9 August, more than 5 million leaflets about the atom bomb had been released over major Japanese cities. The OWI radio station beamed a similar message to Japan every 15 minutes.<ref>https://www.cia.gov/library/center-for-the-study-of-intelligence/kent-csi/docs/v46i3a07p.htm|The Information War in the Pacific - Advertising the Destruction of Hiroshima</ref>. Since the US used both of these nuclear weapons in 1945 no other country has used the atomic bomb in war. The bombs and subsequent surrender also prevented the annexation of Japan's northern islands by the Soviet Union <ref>http://www.afsc.org/newengland/pesp/DecisionToUseABomb.htm</ref><ref>http://www.americanheritage.com/articles/web/20050902-atom-bomb-hiroshima-nagasaki-enola.shtml</ref>.  
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The United States dropped two atomic bombs named [[Little Boy]] and [[Fat Man]] on the Japanese cities of [[Hiroshima]] and [[Nagasaki]] respectively, bringing the war between the US and Japan to a swift and decisive end. The morality of the use of the bombs is debated because of a fear of atomic technology, and because of the huge loss of civilian life (140,000 at Hiroshima, 70,000 at Nagasaki). U. S. officials have said that the cities as a whole were proper military targets, and that because the bombings ended the war so quickly, fewer Japanese civilians were killed than if the bombs had not been used. The US dropped warning leaflets on the cities urging the Japanese to evacuate,<ref>[http://www.pbs.org/wgbh/amex/truman/psources/ps_leaflets.html Leaflets Dropped On Cities In Japan]</ref> but they did not. Since the US used both of these nuclear weapons in 1945 no other country has used the atomic bomb in war. The bombs and subsequent surrender also prevented the annexation of Japan's northern islands by the Soviet Union <ref>http://www.afsc.org/newengland/pesp/DecisionToUseABomb.htm</ref><ref>http://www.americanheritage.com/articles/web/20050902-atom-bomb-hiroshima-nagasaki-enola.shtml</ref>.  
 
The atomic bombs used at Hiroshima and Nagasaki were ''fission'' weapons, which detonate with a massive explosion due to the release of the binding energy within the nucleus of the atom.  Specifically, neutrons in a rapid chain reaction split the nuclei of a heavy chemical element, such as plutonium or uranium, to cause the massive release of energy.
 
The atomic bombs used at Hiroshima and Nagasaki were ''fission'' weapons, which detonate with a massive explosion due to the release of the binding energy within the nucleus of the atom.  Specifically, neutrons in a rapid chain reaction split the nuclei of a heavy chemical element, such as plutonium or uranium, to cause the massive release of energy.
  

Revision as of 19:15, 3 January 2009

Abomb.jpg

The atomic bomb was the name used in the 1940s for the first of what are now called nuclear weapons. The USA developed it during World War II partially out of fear that the Germans and Japanese might be working on such a weapon (as in fact they were, although they did not get very far with their project.) This development represented the peak of technology in World War II. Several other countries now also have atomic bombs which were derived from American technology.

The secret wartime project that developed the bomb was called by the code name the Manhattan project. Much of the development took place at Los Alamos, New Mexico. The laboratories built there for the Manhattan Project became what is today the Los Alamos National Laboratory.

The United States dropped two atomic bombs named Little Boy and Fat Man on the Japanese cities of Hiroshima and Nagasaki respectively, bringing the war between the US and Japan to a swift and decisive end. The morality of the use of the bombs is debated because of a fear of atomic technology, and because of the huge loss of civilian life (140,000 at Hiroshima, 70,000 at Nagasaki). U. S. officials have said that the cities as a whole were proper military targets, and that because the bombings ended the war so quickly, fewer Japanese civilians were killed than if the bombs had not been used. The US dropped warning leaflets on the cities urging the Japanese to evacuate,[1] but they did not. Since the US used both of these nuclear weapons in 1945 no other country has used the atomic bomb in war. The bombs and subsequent surrender also prevented the annexation of Japan's northern islands by the Soviet Union [2][3]. The atomic bombs used at Hiroshima and Nagasaki were fission weapons, which detonate with a massive explosion due to the release of the binding energy within the nucleus of the atom. Specifically, neutrons in a rapid chain reaction split the nuclei of a heavy chemical element, such as plutonium or uranium, to cause the massive release of energy.

After World War II, nuclear weapon research continued with the development of the fusion or thermonuclear weapon. Many tests of these weapons were conducted during the Cold War, but most of these tests took place on remote Pacific islands that were US territories or in the upper atmosphere. These weapons massively exceeded the power of the fission bombs dropped on Japan. Simultaneously, and as a civilian spinoff from the military program, there were developments in the production of efficient nuclear energy for civilian electrical generation. The threat of the use of nuclear weapons was a major issue in the Cold War. Today, the thirty-year threat of the use of nuclear weapons to prevent international aggression have been credited by many with helping avoid another world war.

References

  1. Leaflets Dropped On Cities In Japan
  2. http://www.afsc.org/newengland/pesp/DecisionToUseABomb.htm
  3. http://www.americanheritage.com/articles/web/20050902-atom-bomb-hiroshima-nagasaki-enola.shtml