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?

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

The Half-Life of 131I Is 8 Days

The Half-Life of ¹³¹I Is 8 Days