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Theoceangirl (the_ocean_girl):
Scientists found stone tool specimens in a cave in Africa. Using potassium & ash;argon radiometric dating, they discovered that the tools contained 25 percent radioactive potassium-40. How old are the tools? *The half-life for potassium-40 to argon-40 is 1.25 billion years. Help please!!!
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OpenStudy (anonymous):
i dont even get this
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