※ 引述《woody3724 (woody)》之銘言：
: At the start of an experiment, 10 grams of a certain isotope are present.
: The isotope decays in such a manner that at the end of each consecutive
: hour, 1/2 of the amount of the isotope that was present at the beginning
: of the hour remains. After N hours, between 1 and 0.1 gram of the isotope
: remains.
: Which of the following could be the value of N?
: [ Indicate all such values. ]
: [A] 2 [B] 3 [C] 4 [D] 5 [E] 6 [F] 7 [G] 8 [H] 9
: 為什麼答案不是CDE呢?
答案應當就是 CDE，因為用另一種看法也會得到一樣的結果。
: 10