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Jul 16th, 2015
a. function m(t) = 23 * 2^(-t/1600) Answer
b. 0.5 = e−r*1600 ; 0.693 = r*1600 hence r = 4.332 x 10^(-4) or 0.00043
hence we can write , m(t) = 23* e^(-0.00043 t) Answer
c. m(t) = 23 * 2^(-4000/1600) solving we get m(t) = 4.06 mg or 4 mg Answer
d. 16 = 23 * 2^(-t/1600) solving we get t = 837.699 years or 838 years Answer