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13 June, 18:54

If a sample that originally contained 10 grams of c 14 has gone through two half-lives of decay, how much C 14 will be left?

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  1. 13 June, 19:56
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    It is given in the question that initial amount of C 14 is 10 gms.

    So after first half life, initial amount of C 14 becomes half, that is 5 grams.

    After second half life, the amount left is the half of the amount that we got after first life, that is half of 5 gm which is 2.5 grams.

    So after two half lives, the 10gm C 14 becomes 2.5 gm C 14.
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