We can use the formula for half-life to calculate the fraction of a sample that remains after a certain amount of time:
fraction remaining = (1/2)^(time/half-life)
In this case, the time is 14 days and the half-life is 3.5 days, so we can plug in and simplify:
fraction remaining = (1/2)^(14/3.5)
fraction remaining = (1/2)^4
fraction remaining = 1/16
Therefore, after 14 days, only 1/16th or 0.0625 of the original sample of radium-224 remains undecayed.
The half - life of radium-224 is 3.5 days .what fraction of the sample remain undecaye after fourteen days
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