A piece of burnt wood of mass 20 g is fo...

A piece of burnt wood of mass 20 g is found to have a `.^(14)C` activity of 4 decay `s^(-1)` . How long has the tree that this wood belonged to be dead ? Given `T_((1)/(2))` of `.^(14)C= 5730` year.

1840

1830

1820

1860

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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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