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OpenStudy (anonymous):
MEDAL & FAN ANYBODY ? You have found a mysterious substance that appears to be radioactive. You take a sample to a nuclear chemist who measures out 100 g. of the substance. Thirty hours later, the chemist tests the sample and finds that 6.25 grams of the sample remains radioactive. What is the half-life of the sample? a. 4 hours b. 7.5 hours c. 15 hours d. 30 hours *not d*
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OpenStudy (nbarrera):
about 15 hours
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