An unknown radioactive element decays into non-radioactive substances. In 100 days the radioactivity of a sample decreases by 47 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 62 mg? time needed: (days) Question Help: Video > Next Question

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter4: Exponential And Logarithmic Functions
Section4.6: Modeling With Exponential Functions
Problem 22E
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An unknown radioactive element decays into non-radioactive substances. In 100 days the radioactivity of a
sample decreases by 47 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 62 mg?
time needed:
(days)
Question Help: Video
> Next Question
Transcribed Image Text:An unknown radioactive element decays into non-radioactive substances. In 100 days the radioactivity of a sample decreases by 47 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 62 mg? time needed: (days) Question Help: Video > Next Question
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