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A 135 mCi radioactive tracer is made in a nuclear reactor. When it is delivered to a hospital 18 hours later its activity is 85 mCi. The lowest usable level of activity is 10 mCi.
(a) What is the tracer's half-life?
h
(b) For how long after delivery is the sample usable?
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What is an acceleration of the particle at the instant
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