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標題:

fission of uranium-235

發問:

Which of the gollowing is true regarding the fission of uranium-235? A)The electron is captured by the nucleus, which becomes unstable B)The nuclides produced are indivedually heavier than the uranium nuclide C)The ultimate nuclides produced are more stable than the uranium nuclide.

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最佳解答:

鈾235的分裂如下圖: 圖片參考:http://www.visionlearning.com/library/modules/mid59/Image/VLObject-785-021205011204.gif 它的分裂是因為中子擊中鈾原子核,不是原子核捕獲電子,所以(A)錯。 鈾235分裂後,成為較輕的原子核(氙及鍶),不是成為比較重的原子核,所以(B)錯。 分裂後的較輕原子核比原來的重核更穩定,答案選(C)。 參考資料: http://www.visionlearning.com/library/module_viewer.php?mid=59 http://ffden-2.phys.uaf.edu/212_fall2003.web.dir/Todd_Eide/blast-effects.htm

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