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atomic bomb

From: Encyclopedia Britannica | Date: 2007 | Copyright information

Weapon whose great explosive power results from the sudden release of energy upon the splitting, or fission, of the nuclei of heavy elements such as plutonium or uranium ( nuclear fission). With only 11–33 lb (5–15 kg) of highly enriched uranium, a modern atomic bomb could generate a 15-kiloton explosion, creating a huge fireball, a large shock wave, and lethal radioactive fallout. The first atomic bomb, developed by the Manhattan Project during World War II, was set off on July 16, 1945, in the New Mexico desert. The only atomic bombs used in war were dropped by the U.S. on Hiroshima on Aug. 6, 1945, and on Nagasaki three days later. In 1949 the Soviet Union tested its first atomic bomb, followed by Britain (1952), France (1960), China (1964), India (1974), and Pakistan (1998). Israel and South Africa were suspected of testing atomic weapons in 1979. hydrogen bomb; Nuclear Non-proliferation Treaty; nuclear weapon.For more information on atomic bomb, visit Britannica.com.

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"atomic bomb." Encyclopedia Britannica. 2007. Encyclopedia.com. 8 Jan. 2009 <http://www.encyclopedia.com>.

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