Initially 100 milligrams of a radioactive substance was present. After 9 hours the mass had decreased by 7%. If the rate of decay is proportional to the amount of the substance present at time t, determine the half-life of the radioactive substance. (Round your answer to one decimal place.)
Initially 100 milligrams of a radioactive substance was present. After 9 hours the mass had decreased by 7%. If the rate of decay is proportional to the amount of the substance present at time t, determine the half-life of the radioactive substance. (Round your answer to one decimal place.)
Chapter5: Exponential And Logarithmic Functions
Section: Chapter Questions
Problem 28T: The half-life of radioactive actinium ( 227AC ) is 21.77 years. What percent of a present amount of...
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Initially 100 milligrams of a radioactive substance was present. After 9 hours the mass had decreased by 7%. If the rate of decay is proportional to the amount of the substance present at time t, determine the half-life of the radioactive substance. (Round your answer to one decimal place.)
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