29. Francium-223 87 (223Fr) has a half-life of 21.8 min. (a) How many nuclei are initially...
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29. •• Francium-223 87
(223Fr) has a half-life of 21.8 min.
(a) How many nuclei are initially present in a 25.0-mg sample of 87 223Fr?
(b) What is its initial activity?
(c) How many nuclei will be present 1 h and 49 min later?
(d) What will be the sample’s activity at this later time?
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Related Book For 
College Physics Essentials Electricity And Magnetism Optics Modern Physics Volume Two
ISBN: 9781032337272
8th Edition
Authors: Jerry D. Wilson, Anthony J. Buffa, Bo Lou
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