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A 25 g piece of characoal is found in so...

A 25 g piece of characoal is found in some ruins of an ancient city. The sample shows a `C^(14)` activity of 250 decay/minutes. How long has the three this charcoal came from been dead ? Given, the half-life of `C^(14)` is 5730 years. The ratio of `C^(14) and C^(12)` in the living sample is 1.3 `xx 10^(-12)`.

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