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This exercise uses the radioactive decay model. The half-life of strontium-90 is 28 years. How long will it take a 50-mg sample to decay to

This exercise uses the radioactive decay model. The half-life of strontium-90 is 28 years. How long will it take a 50-mg sample to decay to a mass of 30 mg? (Round your answer to the nearest whole number.) yr Need Help? Read It Watch It

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