1.

The half-life for decay of .^(14)C " by " beta-emission is 5730 years. The fraction of .^(14)C decays, in a sample that is 22,920 years old, would be

Answer»

`1//8`
`1//16`
`7//8`
`15//16`

Solution :`N = N_(0) ((1)/(2))^(t//t_((1)/(2))) = N_(0) ((1)/(2))^((22920)/(5730)) = N_(0) ((1)/(2))^(4) = (N_(0))/(16)` where
`N_(0)`= INITIAL amount, N =amount left so fraction reacted
`N_(0) - (N_(0))/(16) = (15)/(16) N_(0)`


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