A nuclear weapon [a] is an explosive device that derives its destructive force from nuclear reactions, either fission (fission or atomic bomb) or a combination of fission and fusion …

A nuclear weapon is a device designed to release energy in an explosive manner as a result of nuclear fission, nuclear fusion, or a combination of the two. Fission weapons are commonly …

2017年9月6日 · Atomic bombs have been used only twice in war—both times by the United States against Japan at the end of World War II, in Hiroshima and Nagasaki. A period of …

Nuclear explosions are used in nuclear weapons and nuclear testing. Nuclear explosions are extremely destructive compared to conventional (chemical) explosives, because of the vastly …

2024年12月16日 · atomic bomb, weapon with great explosive power that results from the sudden release of energy upon the splitting, or fission, of the nuclei of a heavy element such as …

2022年3月1日 · Nine countries hold the 13,000 nuclear weapons in the global stockpile. That's less than during the Cold War but it doesn't change the fact that these bombs are still a threat …

The effects of a nuclear explosion on its immediate vicinity are typically much more destructive and multifaceted than those caused by conventional explosives. In most cases, the energy …

2014年6月5日 · Explains how a tiny amount of matter contains a tremendous amount of energy. The U.S. developed two types of atomic bombs during the Second World War.

2025年1月21日 · The prompt effects of a nuclear explosion and fallout are well known through data gathered from the attacks on Hiroshima and Nagasaki in Japan; from more than 500 …

On the afternoon of December 2, 1942, with 42 observers watching the instruments and listening to the clicking of the neutron counters, the pile achieved criticality, i.e., a self-sustaining …