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Consider two isotopes, X and Y. X is radioactive and decays to Y. Y is stable....

Consider two isotopes, X and Y. X is radioactive and decays to Y. Y is stable. At time t=0, their respective initial concentrations are X0 and Y0.

(a) Write down the radioactive decay law for X and Y. (Do not solve them)
(b) What are the equilibrium (large times, ??→∞) concentrations for X and Y?

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