Posted by **Melanie** on Saturday, July 30, 2011 at 7:38pm.

Suppose a sample of Cesium-137 with initial mass of 200 grams decays to a mass of 160 grams voer the course of 10 years.

Find the half-life of Cesium-137 (Round to the nearest year)

How much Cesium-137 is left in the sample after 60 years? Round to the nearest tenth of a gram.

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