Question:
This exercise uses the radioactive decay model. Radium-221
Last updated: 7/19/2022
![This exercise uses the radioactive decay model. Radium-221](https://media.kunduz.com/media/sug-question/raw/59992199-1658213004.210414.jpeg?h=512)
This exercise uses the radioactive decay model. Radium-221 has a half-life of 30 sec. How long will it take for 96% of a sample to decay? (Round our answer to the nearest whole number.)