The half life of Bi–210 is 5 days. In what period of time would the activity of a given sample of isotope be reduced by 20%?

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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The half life of Bi–210 is 5 days. In what period of time would the activity of a given sample of isotope be reduced by 20%?
A. 1.61 days    B. 3.68 days     C. 6.61 days     D. 11.61 days

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