Radium ra decays to radon rn which decays to polonium if at, Ask an Expert

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Radium (Ra) decays to radon (Rn) which decays to polonium. If at t = 0, a sample is pure radium, how much polonium does it contain at time t? Suppose No is the number of radium atoms at t = 0, and Lambda1 and Lambda2 are the decay constants for Ra and Rn.

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