Question: This exercise uses the radioactive decay model. Radium-221 has a half-life of 30 sec. How long will it take for85%of a sample to decay? (Round

This exercise uses the radioactive decay model.

Radium-221 has a half-life of 30 sec. How long will it take for85%of a sample to decay? (Round your answer to the nearest whole number.)

sec

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