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Moon Rocks In one of the rocks brought back from the Moon,

Chapter 32, Problem 73GP

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QUESTION:

Problem 73GP

Moon Rocks In one of the rocks brought back from the Moon, it is found that 80.5% of the initial potassium-40 in the rock has decayed to argon-40. (a) If the half-life for this decay is 1.20 × 109 years, how old is the rock? (b) How much longer will it take before only 10.0% of the original potassium-40 is still present in the rock?

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QUESTION:

Problem 73GP

Moon Rocks In one of the rocks brought back from the Moon, it is found that 80.5% of the initial potassium-40 in the rock has decayed to argon-40. (a) If the half-life for this decay is 1.20 × 109 years, how old is the rock? (b) How much longer will it take before only 10.0% of the original potassium-40 is still present in the rock?

ANSWER:

Step 1 of 3

The radioactive decay of potassium- 40 can be used to determine the age of a Moon rock.

The number of radioactive nuclei in a sample is calculated from equation  and decay constant from equation 32-10.

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