Asked by Anonymous
                if the half life of a radioactive isotope is 80 hours how long would it take for 75% of the isotope to decay
            
            
        Answers
                    Answered by
            oobleck
            
    if 75% has decayed, 25% is left
1/4 = (1/2)^2
so it takes two half-lives, or 160 hours
    
1/4 = (1/2)^2
so it takes two half-lives, or 160 hours
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