- #1

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To be more specific, here is a problem which can be solved using that formula:

"A substance has a half life of 100s, and starts with 10

^{20}unstable nuclei.Calculate the initial activity, and from this work out the time taken for all of the nuclei to decay if the activity did not decrease with time"

The only formulas I could find were:

A (final activity)= A

_{0}*e

^{-decay constant*time}

N (final number of nuclei)= N

_{0}*e

^{-decay constant*time}

But nothing clearing expressing the relationship between A

_{0}and N

_{0}