One of the main contaminants of a nuclear accident, such as that at Chernobyl, is strontium-90, which decays exponentially at a rate of approximately 2.4% per year. (a) Write the percent of strontium-90 remaining, P, as a function of years, t, since the nuclear accident. [Hint: 100% of the contaminant remains at t = 0.] P(t) = (b) Estimate the half-life of strontium-90. NOTE: Round your answer to the nearest integer. The half-life of strontium-90 is (c) After the Chernobyl disaster, it was predicted that the region would not be safe for human habitation for 100 years. Estimate the percent of original strontium-90 remaining at this time. NOTE: Round your answer to the nearest integer. There is about of original strontium-90 remaining at this time. years. %

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