If one waits for a time equal to two half-lives for a certain radioactive material,all of it originally present will have decayed completely.

Name: If one waits for a time equal to two half-lives for a certain radioactive material,all of it originally present will have decayed completely.
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If one waits for a time equal to two half-lives, only 1/4th of the original amount of radioactive material will remain. It takes an infinite amount of time for all of it to decay completely.

If One Waits for a Time Equal to Two Half-Lives