If an Isotope Has a Half-Life of 50 Million Years,and

question 8

Multiple Choice

If an isotope has a half-life of 50 million years,and 1/8 of the sample remaining consists of that isotope,what is the age of the rock from which it was taken?

• A) 400 million years
• B) 300 million years
• C) 150 million years
• D) 800 million years
• E) none of these

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