1.

The radioactively due to C^(14) isotope (half-life 6000 years) of a sample of wood from an ancient tomb was found to be nearly half that of fresh wood, the tomb is therefore about

Answer»

3000 years old
6000 years old
9000 years old
1200 years old

Solution :`N = N_(0) xx ((1)/(2))^(n)`
`(1)/(2) = 1 xx ((1)/(2))^(n) , n = 1`
`t = n xxt_(1//2) = 1 xx 6000 = 6000` yrs


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