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You are studying a sample of granite that is about 2.1 billion years old. You know it contains some amount of uranium-235, the radioactive parent isotope that decays to its daughter, lead-207. The half-life of uranium-235 is about 700 million years. Based on the number of half lives that have elapsed since the granite fomed (you need to determine this), about _____% of the uranium-235 that was in the granite at its formation is still present in the rock and has not yet decayed into lead-207. (Enter a numeric value between 0 and 100)

You are studying a sample of granite that is about 2.1 billion years old. You know it contains some amount of uranium-235, the radioactive parent isotope that decays to its daughter, lead-207. The half-life of uranium-235 is about 700 million years. Based on the number of half lives that have elapsed since the granite fomed (you need to determine this), about _____% of the uranium-235 that was in the granite at its formation is still present in the rock and has not yet decayed into lead-207. (Enter a numeric value between 0 and 100)

Chemistry: Matter and Change
Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter24: Nuclear Chemistry
Section: Chapter Questions
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You are studying a sample of granite that is about 2.1 billion years old.

You know it contains some amount of uranium-235, the radioactive parent isotope that decays to its daughter, lead-207. The half-life of uranium-235 is about 700 million years.

Based on the number of half lives that have elapsed since the granite fomed (you need to determine this), about _____% of the uranium-235 that was in the granite at its formation is still present in the rock and has not yet decayed into lead-207. (Enter a numeric value between 0 and 100)

 

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