Calculate the number of remaining atoms by subtracting the number of pennies ... (Example: Asking questions about how the half-life of a radioactive isotope affects its use in carbon dating.) ...

0.0625 of the original sample This could then be incorporated into other data. So, if the half-life is two days, four half-lives is 8 days. If a sample has a count rate of 3,200 Bq at the start ...