1 gram of cesium-137 (.(55)^(137)Cs) dec...

1 gram of cesium-137 `(._(55)^(137)Cs)` decays by `beta`-emission with a half-life of 30 years. What is (a) the resulting isotope ? (b) the number of atoms left after 5 years? (c) if initial activity of sample is 1mCi then what is the activity of cesium after 5 years?

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