Concept explainers
The isotope of plutonium 238Pu is used to make thermoelectric power sources for spacecraft. Suppose that a space probe was launched in 2012 with 2.0 kg of 238Pu .
a. If the half-life of 238Pu is 87.7 yr, write a function of the form Q(t)=Q0e−kt to model the quantity Q(t) of 238Pu left after t years.
b. If 1.6 kg of 238Pu is required to power the spacecraft’s data transmitter, for how long after launch would scientists be able to receive data? Round to the nearest year.

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