If 80% of a radioactive element remains radioactive after 250 years, what percent remains radioactive after 600 years? What is the half life of the element?

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- Jun 14th 2009, 05:02 PMNevershRadioactive Decay
If 80% of a radioactive element remains radioactive after 250 years, what percent remains radioactive after 600 years? What is the half life of the element?

- Jun 14th 2009, 05:22 PMJhevon