The isotope 40K can decay to either 40Ca or 40Ar; assume both decays have a half-life of
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The isotope 40K can decay to either 40Ca or 40Ar; assume both decays have a half-life of 1.26 x 109 y. The ratio of the Ca produced to the Ar produced is 8.54/1 = 8.54. A sample originally had only 40K. It now has equal amounts of 40K and 40Ar; that is, the ratio of K to Ar is 1/1 = l. How old is the sample?
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We note that every Calcium40 atom and Krypton40 atom ...View the full answer
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Related Book For 
Fundamentals of Physics
ISBN: 978-0471758013
8th Extended edition
Authors: Jearl Walker, Halliday Resnick
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