# The nucleus of Element X is unstable and decays into Element Y with a probability z....

###### Question:

The nucleus of Element X is unstable and decays into Element Y with a probability z. You are given a pure sample of Element X for a physics assignment, but by the time you get around to doing it, there are six times as many atoms of Element Y as Element X. How much time did you wait before observing in terms of z

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