Posted by **Anonymous** on Tuesday, March 19, 2013 at 12:19pm.

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?

- sciencemath -
**Steve**, Tuesday, March 19, 2013 at 12:20pm
966/138 = 7

7 half-lives means that 1/128 of the original 31g remains.

- Algebra -
**Son Ma**, Tuesday, November 11, 2014 at 9:25am
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?

- sciencemath -
**Anonymous**, Thursday, April 9, 2015 at 5:43pm
7:.24

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