The isotope of plutonium 238. Pu. Part: 0 / 2 Part 1 of 2 238, Pu is used to make thermoelectric power sources for spacecraft. Suppose that a space probe was launched in 2012 with 2.5 kg of 238. (a) If the half-life of Pu is 87.7 yr, write.a function of the form Q(t)=Qe of k to five decimal places. Do not round intermediate calculations. -kt 238. to model the quantity (t) of Pu left after t years. Round the value Q(t)= 2.5 Part: 1/2 Part 2 of 2 e (b) If 1.7 kg of Pu 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. Do not round intermediate calculations. 238. Scientists will be able to receive data for approximately yr. Continue Espaol Submit Accia B 89 Painful bone metastases are common in advanced prostate cancer. Physicians often order treatment with strontium-89 (Sr), a radionuclide with a strong affinity for bone tissue. A patient is given a sample containing 4 mCi of 89 Sr. Part: 0 / 2 Part 1 of 2 89 (a) If 25% of the Sr remains in the body after 90 days, write a function of the form Q (t)=Qe to model the amount Q (t) of radioactivity in the body t days after the initial dose. Round the value of k to five decimal places. Do not round intermediate calculations. -kt Q(t)= e Part: 1/2 Part 2 of 2 89 (b) What is the biological half-life of Sr under this treatment? Round to the nearest day. Do not round intermediate calculations. 89 The biological half-life of Sr is approximately days. x Continue Espa