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OpenStudy (anonymous):

Erwin was measuring a radioactive substance in the laboratory . he measured 8.0 kg of substance X at noon Tuesday .At noon Friday three days later erwin measured 1.0 kg of substance x. what is the half- life of substance X ? Erwin was measuring a radioactive substance in the laboratory . he measured 8.0 kg of substance X at noon Tuesday .At noon Friday three days later erwin measured 1.0 kg of substance x. what is the half- life of substance X ? @Physics

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