Homework Help: physical science

Posted by sue moore on Saturday, February 16, 2013 at 3:53pm.

cobalt-60 has a half-life of 5.26 years, how much of a 500 gram sample will be left after 21 years

physical science - drwls, Saturday, February 16, 2013 at 4:01pm
500*'(1/2)^(21/5.26) grams

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