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OpenStudy (anonymous):
After three half-lives, a sample contains 10 grams of parent isotopes. How many grams of the parent isotope were present to start? 320 160 80 40 (Earth Space)
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OpenStudy (anonymous):
the number is divided by two at each half-life (hence the name). so 10*2^3
OpenStudy (anonymous):
the asnwer is 40 -,-
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