A rock sample which originally contained 400 grams of radioactive isotope X now contains 25 grams of the material.  The half-life of isotope X is 10,000 years.  How old is the rock sample?

An Introduction to Physical Science
14th Edition
ISBN:9781305079137
Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Chapter24: Geologic Time
Section: Chapter Questions
Problem 11MC: If the half-life of a radioactive specimen is 100 years, then how long will it take for the specimen...
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A rock sample which originally contained 400 grams of radioactive isotope X now contains 25 grams of the material.  The half-life of isotope X is 10,000 years.  How old is the rock sample?  (Give your answer without any punctuation or lables.  For example: 15000).

 

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