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[-/ 1 Points] DETAILS 0/6 Submissions Used This exercise uses the radioactive decay model. Radium-221 has a half-life of 30 sec. How long will it

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[-/ 1 Points] DETAILS 0/6 Submissions Used This exercise uses the radioactive decay model. Radium-221 has a half-life of 30 sec. How long will it take for 92% of a sample to decay? (Round your answer to the nearest whole number.) sec Need Help? Read It

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