By comparing a samples isotope ratio it is possible to see that after 3000 years, the original radioisotope had decayed to 12% of its original value. Estimate the half life of that particular isotope.
A) about 1000 years
B) about 1500 years
C) about 4500 years
D) about 6000 years
E) about 9000 years
Correct Answer:
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