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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
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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? Explain your answer.

User Hugh Bothwell
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the half live of the substance would be 9 hours
24x3=72
72/8=9
half life would be 9 hours

User Krawyoti
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