A(SO)- 97.657 is present ofter (a) What is the initial amount of the isotope present in the sample? AGamount of a radioactive isotope present in a certain sample at time t is given by A(t) : = 400e-0.02828t grams, where t years is the time since the initial amount was measured. (a) What is the initial amount of the isotope present in the sample? (b) How much of the isotope is present after 50 years? 50 yeaks రం (c) How much is half of the initial value? 1200

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