A freshly prepared sample of a certain radioactive isotope


A freshly prepared sample of a certain radioactive isotope has an activity of 10 mCi. After 4 h, the activity is 8 mCi.

(a) Find the decay constant and half-life of the isotope.

(b) How many atoms of the isotope were contained in the freshly prepared sample?

(c) What is the sample's activity 30 h after it is prepared?

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Chemical Engineering: A freshly prepared sample of a certain radioactive isotope
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