# Radioactive decay.

The decay rate of krypton - 85 is 6.3% per day. What is the half-life?

P(t) = Poe^kt

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If every day 6.3% of krypton is decayed, this means that we are left at the end of every day with 0.937 of the amount present at the beginning of the day..

Thus, after n days, the amount will be (0.937)^n of the initial amount

Half life is ...

#### Solution Summary

The solution shows how to apply the exponential decay equation to the problem of Krypton disintegration.

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