Cesium-137, which has a half-life of 30.2 yr, is a componentof the radioactive waste from nuclear power plants. If theactivity due to cesium-137 in a sample of radioactive waste hasdecreased to 35.2% of its initial value, how old is the sample?(a) 1.04 yr (b) 15.4 yr (c) 31.5 yr (d) 45.5 yr (e) 156 yr

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