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The half-life of 131I is 8 days. On a certain day, the activity of an 131I sample is 6.4 mCi. What ...

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The half-life of 131I is 8 days. On a certain day, the activity of an 131I sample is 6.4 mCi. What ...

The half-life of 131I is 8 days. On a certain day, the activity of an 131I sample is 6.4 mCi. What is its activity 40 days later?

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