Chemistry, 12.10.2019 09:30 jjmarie612
Cesium-137 has a half-life of 30 years. you find a sample with 3 g of cesium-137. how much cesium-137 existed in the sample 90 years ago?
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Cesium-137 has a half-life of 30 years. you find a sample with 3 g of cesium-137. how much cesium-13...
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