Problem: Analysis of a quartz crystal shows it to contain 25% Uranium 235 and 75%  Lead 207. If the half life of Uranium 235 is 704 million years how old is the quartz crystal?

FREE Expert Solution

We have to determine the age of a quartz crystal which contains 25% U-235 and 75% Pb-207.

Uranium is a radioactive metal which decays by a series of reactions to form Pb-207.

The half-life of a radioactive element is the time that it takes for 50% of the element to decay.

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Problem Details

Analysis of a quartz crystal shows it to contain 25% Uranium 235 and 75%  Lead 207. If the half life of Uranium 235 is 704 million years how old is the quartz crystal?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the First Order Half Life concept. You can view video lessons to learn First Order Half Life. Or if you need more First Order Half Life practice, you can also practice First Order Half Life practice problems.