Question

The mass ratios of 40Ar to 40K can also be used to date geological materials. Potassium-40 decays by two processes:
a. Why are 40Ar/40K ratios rather than 40Ca/40K ratios used to date materials?
b. What assumptions must be made in using this technique?
c. A sedimentary rock has a 40Ar/40K ratio of 0.95. Calculate the age of the rock.
d. How will the measured age of a rock compare with the actual age if some 40Ar has escaped from the sample?


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  • CreatedMay 05, 2015
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