Homework Help: Physical Science- Help Please!

Posted by Molly on Wednesday, December 5, 2012 at 4:13pm.

Suppose that you are given a 100 gram sample of a radioactive substance with a half-life of 32 days. How many grams will be left after 192 days?

Physical Science- Help Please! - Steve, Wednesday, December 5, 2012 at 4:14pm
192 days is 6 half-lives.

(1/2)^6 = 1/64

1/64 * 100 g = 1.5625 g

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