200分求一道物理题 求懂英文高手解答Suppose that we have 39936 atoms of a radioactive substance with a half-life of 3 hours. a. How many atoms of that element remain after 15 hours?Answer= 多少atomsb. How many atoms remain after 21

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200分求一道物理题 求懂英文高手解答Suppose that we have 39936 atoms of a radioactive substance with a half-life of 3 hours. a. How many atoms of that element remain after 15 hours?Answer= 多少atomsb. How many atoms remain after 21

200分求一道物理题 求懂英文高手解答Suppose that we have 39936 atoms of a radioactive substance with a half-life of 3 hours. a. How many atoms of that element remain after 15 hours?Answer= 多少atomsb. How many atoms remain after 21
200分求一道物理题 求懂英文高手解答
Suppose that we have 39936 atoms of a radioactive substance with a half-life of 3 hours.
a. How many atoms of that element remain after 15 hours?
Answer= 多少atoms
b. How many atoms remain after 21 hours?
Answer= 多少atoms

200分求一道物理题 求懂英文高手解答Suppose that we have 39936 atoms of a radioactive substance with a half-life of 3 hours. a. How many atoms of that element remain after 15 hours?Answer= 多少atomsb. How many atoms remain after 21
a.How many atoms of that element remain after 15 hours?
Answer= 1248 atoms
b.How many atoms remain after 21 hours?
Answer= 312 atoms

应该是b

我只能翻译出来。我才初三。我也不会。加油~！
假设我们有39936个原子的放射性物质的半衰期为3小时。
A .多少原子，元素保持15小时后？
回答=多少原子
有多少原子保持21小时后？
回答=多少原子

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