Solve Problem 45.5(b) by using the exponential function. Problem 45.5(b) Cobalt-60 (60Co) is often used as a
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Solve Problem 45.5(b) by using the exponential function.
Problem 45.5(b)
Cobalt-60 (60Co) is often used as a radiation source in medicine. It has a half-life of 5.25 years. How long after a new sample is delivered will its activity have decreased
(b) To about one-third its original value? Give your answers to two significant figures.
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