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    exponential decay and half-life

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    Is there just one formula to calculate half life problems? What is the process or formula for solving these problems.

    1. A 2.5 gram of an isotope of stontium-90 was formed in a 1960 explosion of an atomic bomb at Johnson island inthe Pacific test Site. The half -life of strontium-90 is 28 years. In what year will only .625 grams of this stontium-90 remain?

    2. Actinium-226 has a hlaf-life of 29 hours. If 100 mg of actinium-226 disintegrates over a period of 58 hours, how many mg of actinium-226 will remain.

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    Solution Summary

    The solution is comprised of two exponential decay examples. It explains the half-life, decay constant, quantity remained relationship in detail.