As mentioned in the previous Practice Exercise 1, cesium-137, a component of radioactive waste, has a half-life of 30.2 yr. If a sample of waste has an initial activity of 15.0 Ci due to cesium-137, how long will it take for the activity due to cesium-137 to drop to 0.250 Ci? (a) 0.728 yr (b) 60.4 yr (c) 78.2 yr (d) 124 yr (e) 178 yr

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