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English, 23.06.2019 18:30 teresaswinger

Potassium-40 (k-40) decays into argon-40 (ar-40). after 1.25 billion years, 20 grams of k-40 would be reduced to 10 grams. how much of the original k-40 would remain after 5 billion years? a. 0 grams b. 1.25 grams c. 2.5 grams d. 5 grams

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Potassium-40 (k-40) decays into argon-40 (ar-40). after 1.25 billion years, 20 grams of k-40 would b...
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