In A = In Ao – kt where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substanc -1 For the radioactive isotope lead-210, k is 3.30 × 10-2 years If the original amount of lead-210 in a sample is 39.5 mg, how much time is needed for the amount of lead-210 that remains to fall to 19.3 mg? years

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