Thorium-234 Thorium-234 is a radioactive isotope that decays at a rate proportional to the amount present. Suppose that 1 gram of this material is reduced to 0.80 grams in one week.
(a) Find an expression for the amount of Th-234 present at a general time t.
(b) Find the half-life of Th-234.
(c) Find the amount of Th-234 left after 10 weeks.
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