Initially 100 milligrams of a radioactive substance was present. After 7 hours the mass had decreased by 6%. 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.) hr
Initially 100 milligrams of a radioactive substance was present. After 7 hours the mass had decreased by 6%. 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.) hr
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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Transcribed Image Text:Initially 100 milligrams of a radioactive substance was present. After 7 hours the mass had decreased by 6%. 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.)
hr
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