Posted by **Kipper** on Sunday, April 4, 2010 at 6:58pm.

Radon-22 has a half life of 4 days. If you begin with 32 grams of radon, how many grams will be left after 20 days?

- 7th grade -
**drwls**, Sunday, April 4, 2010 at 7:17pm
20 days is 5 half-lives.

Divide 32 by two, five times.

That is the same as dividing 32 by 2^5.

- 7th grade -
**Kipper**, Monday, April 5, 2010 at 12:00am
thank you drwls for the help

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