Given an initial amount of 11 grams of the isotope, how many grams will remain after 15,000 years?
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Note the general formula F = A * (1/2)^(t / h), where F is the final amount, A is the initial amount, t is the time which has passes, and h is the half-life.
Amount left after 15000 years
= 11 * (1/2)^(15000 / 1599)
= 0.016499528 grams
Amount left after 15000 years
= 11 * (1/2)^(15000 / 1599)
= 0.016499528 grams