The half-life of cobalt 60 is 5 years. (a) Obtain an exponential decay model for cobalt 60 in the form Q = Qoe -0.138t Q(t)= Q.e X vr -kt. (Round the decay constant to three significant digits.) Your answer cannot be understood or graded. More Information (b) Use your model to predict, to the nearest year, the time it takes one quarter of a sample of cobalt 60 to decay. 9

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