An unknown radioactive element decays into non-radioactive substances. In 340 days the radioactivity of a sample decreases by 71 percent. (a) What is the half-life of the element? half-life: (days) Round to two decimal places. (b) How long will it take for a sample of 100 mg to decay to 76 mg? time needed: (days) Round to two decimal places.

An unknown radioactive element decays into non-radioactive substances. In 340 days the radioactivity of a sample decreases by 71 percent. (a) What is the half-life of the element? half-life: (days) Round to two decimal places. (b) How long will it take for a sample of 100 mg to decay to 76 mg? time needed: (days) Round to two decimal places.

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 20E

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