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?
10