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The Cosmic Perspective Fundamentals | 2nd Edition | ISBN: 9780133889567 | Authors: Jeffrey O. Bennett; Megan O. Donahue; Nicholas Schneider; Mark Voit
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QUESTION:

Problem 23SEQ

Explain answer clearly, with complete sentence and proper essay structure, if needed. An asterisk (*) designates a quantitative problem, for which you should show all your work.

*Radiometric Dating. For each of the following, assume all the argon-40 comes from radioactive decay of potassium-40, a process with a half-life of 1.25 billion years.

a. You find a rock that contains equal amounts of potassium-40 and argon-40. How old is it? Explain.

b. You find a rock that contains three times as much argon-40 as potassium-40. How old is it? Explain.

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QUESTION:

Problem 23SEQ

Explain answer clearly, with complete sentence and proper essay structure, if needed. An asterisk (*) designates a quantitative problem, for which you should show all your work.

*Radiometric Dating. For each of the following, assume all the argon-40 comes from radioactive decay of potassium-40, a process with a half-life of 1.25 billion years.

a. You find a rock that contains equal amounts of potassium-40 and argon-40. How old is it? Explain.

b. You find a rock that contains three times as much argon-40 as potassium-40. How old is it? Explain.

ANSWER:

Solution

Step 1 of 2

In Radiometric the Half-life is the time required for a quantity to reduce to half from its initial value.

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