Question

Cesium-137 has a half-life of 30 years. If you start with 1.0 g of 137Cs, how much 137Cs will be remaining after 60 years? O 0.30 g O 0.50 g O 0.90 g O 0.00 g O 0.25 g SUBMIT

Answer 1

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.

Please rate.