Cobalt-60 (60Co) is often used as a radiation source in medicine. It has a half-life of 5.25

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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 

(a) To about one-eighth its original value? 

(b) To about one-third its original value? Give your answers to two significant figures.

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