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  3. the half-life of radium-226 is 1600 years. suppose

The half-life of radium-226 is 1600 years. Suppose you have a 20-mg sample. How long...

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The half-life of radium-226 is 1600 years. Suppose you have a 20-mg sample. How long will it take to decay to 7-mg? Round to 4 decimal places.

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