the ratio of the remaining number

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Half-lives of two radioactive substances A and B are, respectively, 20 min and 40 min. Initially, the samples of A and B have equal number of nuclei. After 80 min, the ratio of the remaining number
18
Oct
Half-lives of two radioactive substances A and B are, respectively, 20 min and 40 min. Initially, the samples of A and B have equal number of nuclei. After 80 min, the ratio of the remaining number 20 min and 40 min. Initially Half-lives of two radioactive substances A and B are respectively the ratio of [...]
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Tags: 20 min and 40 min. Initially , Half-lives of two radioactive substances A and B are , respectively , the ratio of the remaining number , the samples of A and B have equal number of nuclei. After 80 min ,