作者smoth (MASTER!! )
看板Chemistry
標題半衰期的問題
時間Thu Feb 16 23:05:36 2006
The number of half-lives needed for a radioactive element to decay to
about 6% of its original activity is
A)2 B)3 C)4 D)5 E)6
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1F：→ yacat:100→50→25→12.5→6.25 ，所以衰變了四次。 02/16 23:24