13R.3 Suppose that you have two samples of radioactive nuclei, one with a half-life of tA=1.0y and one with a half-life of tB=4.0y. Assume that both samples are roughly equally active at time t=0 when you mix them. How long a time T will you have to wait for the activity of the combined sample to decrease to one-half of its original activity? (Hint: You may not be able to solve for T symbolically in terms of tA and tB, but you can use numerical methods.) c 1.860t1/2. 13R.3 Suppose that you have two samples of radioactive nuclei, one with a half-life of tA=1.0y and one with a half-life of tB=4.0y. Assume that both samples are roughly equally active at time t=0 when you mix them. How long a time T will you have to wait for the activity of the combined sample to decrease to one-half of its original activity? (Hint: You may not be able to solve for T symbolically in terms of tA and tB, but you can use numerical methods.) c 1.860t1/2