Physics, 23.06.2019 21:10 michaelowenmccollum

A50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured periodically. after 19.7 days, the amount of radioactive substance had decreased to 3.13 mg. what is the half-life of the unknown radioactive substance?

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A50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured peri...