An unknown radioactive element decays into non-radioactive substances. In 700 days the radioactivity of a sample decreases by 40 percent. How long will it take for a sample of 100 mg to decay to 71 mg? Round to the nearest days. 155 days B 359 days C. 469 days 274 days
An unknown radioactive element decays into non-radioactive substances. In 700 days the radioactivity of a sample decreases by 40 percent. How long will it take for a sample of 100 mg to decay to 71 mg? Round to the nearest days. 155 days B 359 days C. 469 days 274 days
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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