Measurements on a certain isotope tell you that the decay rate decreases from 8318 decays/min to 3091

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Measurements on a certain isotope tell you that the decay rate decreases from 8318 decays/min to 3091 decays/min in 4.00 days. What is the half-life of this isotope?
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University Physics With Modern Physics

ISBN: 978-0073513881

2nd edition

Authors: Wolfgang Bauer, Gary Westfall

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