Practice Problem 7

Calculate the fraction of 14C that remains in a sample after eight half-lives.


Half of the 14C  present initially decays during the first half-life, half of what is left decays during the second half-life, and so on.  The 14C   left after eight half-lives is equal to one-half raised to the eighth power:

(1/2)8 = 0.00391

Less than 0.4% of the original  is left after eight half-lives.

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