The activity of an Iodine – 131 is 10 curies. After how many half-li

1.	The activity of an Iodine – 131 is 10 curies. After how many half-lives will it come down to 625 millicuries?
Answer» Activity of an Iodine – 131 = 10 curies To find number of half-lives for coming it to 625 millicuries, 10 * 1^st\| = 5 (1^st half-life) 5* \| = 2.5 (2^nd half-life) 2.5 * \| = 1.25 (3^rd half-life) 1.25 * \| = 0.625 (4^th half-life) So during 4^th half-life the Iodine – 131 reduces to 625 millicuries.

The activity of an Iodine – 131 is 10 curies. After how many half-lives will it come down to 625 millicuries?

Answer»

Activity of an Iodine – 131 = 10 curies

To find number of half-lives for coming it to 625 millicuries,

10 * 1^st| = 5 (1^st half-life)

5* | = 2.5 (2^nd half-life)

2.5 * | = 1.25 (3^rd half-life)

1.25 * | = 0.625 (4^th half-life)

So during 4^th half-life the Iodine – 131 reduces to 625 millicuries.

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The activity of an Iodine – 131 is 10 curies. After how many half-lives will it come down to 625 millicuries?

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