Iodine 131 is the radioactive material which decays according to function A(t) = A0e-0.087t, where A0 is initial amount present and A is th amount present at time t(in days). Suppose that scientist has sample of 100 grams of iodine 131.
(i) Find decay rate of iodine 131?
(ii) how much iodine 131 is left after nine days?
(iii) when will 70 grams of iodine 131 be left?
(iv) Determine half life of iodine 131?