Define what assumption is made about the origin of the argon

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A 269 mg sample of rock was found to have 2.45 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.45 × 10-6 mol of argon-40. How old was the rock? (Hint: What assumption is made about the origin of the argon-40?). Enter your answer in scientific notation:

Reference no: EM13249322

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