Question: Please include step by step solution, thank you! B. The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at

Please include step by step solution, thank you! B. The radioactive

Please include step by step solution, thank you!

B. The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. How long will it take for 90% of the lead to decay

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