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The half-life of strontium 90 is 28 years.(a) Obtain an exponential decay model for strontium 90 in the formQ(t) =Q 0 e kt . (Round

The half-life of strontium 90 is 28 years.(a) Obtain an exponential decay model for strontium 90 in the formQ(t) =Q0ekt. (Round coefficients to three significant digits.)

Q(t) =

(b) Use your model to predict, to the nearest year, the time it takesthree-fifthsof a sample of strontium 90 to decay. (Round your answer to the nearest year.)

________yr?

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