Posted by **cheryl** on Wednesday, November 2, 2011 at 10:08pm.

A certain radioactive substance has a half-life of 1 hour. If you start with 1 gram of the material at noon, how much will be left at 3:00 P.M.? At 6:00 P.M.? At 10:00 P.M.?

- physical science -
**Eugene **, Friday, September 18, 2015 at 8:40am
10

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