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

- Physical Science- Help Please! -
**alisa**, Tuesday, April 28, 2015 at 11:16am
Carbon 14 has a half-life of 5,730 years. How long will it take for 400 grams of carbon 14 to decay to the point that only 100 grams are carbon 14.

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