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?

Glencoe Physics: Principles and Problems, Student Edition
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Author:Paul W. Zitzewitz
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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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