In one of the rocks brought back from the Moon, it is found that 80.5% of the
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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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Solve Equation 329 for the age of the rock where the decay constant is c...View the full answer
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