The half-life of a radioactive substance is the time it takes for half the substance to decay.
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The half-life of a radioactive substance is the time it takes for half the substance to decay. Suppose the half-life of a substance is 3 years and that 1015 molecules of the substance are present initially. How many molecules will be unchanged after 15 years?
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If 10 15 molecules are present initially then 1210 15 molecules will be pr...View the full answer
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