作者smoth (MASTER!! )
看板Chemistry
标题半衰期的问题
时间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
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 218.165.132.219
1F：→ yacat:100→50→25→12.5→6.25 ，所以衰变了四次。 02/16 23:24