Suppose a laboratory has a 31 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 966 days? How much polonium is in the sample 966 days later?
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7 half-lives, which means that 1/128 of the original 31g remains.
hgreen21:
Hope that's right. :) And hope it helps.
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