An unknown radioactive element decays into non-radioactive substances. In 820 days the radioactivity of a sample decreases by 34 percent. (a) What is the half-life of the element? half-life: (days) (b) How long will it take for a sample of 100 mg to decay to 76 mg? time needed: (days)

College Algebra
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Author:Ron Larson
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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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An unknown radioactive element decays into non-radioactive substances. In 820 days the radioactivity of a sample decreases
by 34 percent.
(a) What is the half-life of the element?
half-life:
(days)
(b) How long will it take for a sample of 100 mg to decay to 76 mg?
time needed: (days)
Transcribed Image Text:An unknown radioactive element decays into non-radioactive substances. In 820 days the radioactivity of a sample decreases by 34 percent. (a) What is the half-life of the element? half-life: (days) (b) How long will it take for a sample of 100 mg to decay to 76 mg? time needed: (days)
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