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A 9-microgram sample of a radioactive isotope decays to 7.61 micrograms in 7 min. What...

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A 9-microgram sample of a radioactive isotope decays to 7.61 micrograms in 7 min. What is the half-life of the radioactive isotope, in minutes? Usethe exponential decay equation A = Aowhere A is the amount of a radioactive material present after time t, k is the half-life of the radioactivematerial, and Ao is the original amount of radioactive substance. (Round your answer to two decimal places.)() t/K,min

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