The Amount At, micrograms of a certain radioactiv substance remaining after t years decreases according to the formula At=Aoe^-0.002t , where Ao is the amount present initially
a) If 600 micrograms are left after 1000years, how many micrograms were present initially?
b) The half-life of a substance is the time taken for the amount to decrease to half of its initial amount. What is the half-life of this substance?
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