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The half-life of the radioactive isotope polonium-214 is 1.64×10-4 seconds. How long will it take for...

The half-life of the radioactive isotope polonium-214 is 1.64×10-4 seconds.

How long will it take for the mass of a sample of polonium-214 to decay from 70.0 micrograms to 17.5 micrograms?

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