# half-life radioactive decay

Cesium-137 is radioactive and has a half life of 30. years. How much of a 7.60mg sample would be left after 53.0 years?Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol.

Cesium-137 is radioactive and has a half life of 30. years. How much of a 7.60mg sample would be left after 53.0 years?Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol.