Answers
0.25 g is the right answer.
Cesium -137 has half life of 30 years. It means half of the material is degraded in 30 years.
We have provides with 1 g of cesium.
After 30 years, the cesium found is of 1/2 = 0.5 g
After next 30 years, the cesium found is of 0.5/2=0.25 g
Hence after 60 years, 0.25 g is found.
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