The sandals in disintegrations per minute per gram? assume, Ask an Expert

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Several hundred pairs of sandals found in a cave in Oregon were found by C-14 dating to be 9.0 x 103 years old. What must have been the activity of the C-14 in the sandals in disintegrations per minute per gram? Assume the original activity was 15.3 disintegrations per minute per gram.

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