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The activity of the hair of an egyptain ...

The activity of the hair of an egyptain mummy is 7 disinetgration `"minute"^(-1)` of of `C^(14)`. Find the age of mummy. Given `t_(0.5)` of `C^(14)` is `1570` year and disintegration rate of fresh sample of `C^(14)` is `14` disntegration `"minute"^(-1)`.

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