If 50% of a radioactive element remains after 4000 years, what is the half-life?

Hey there!

A half-life means after a certain amount of time, half of that substance will be gone/changed after that time.

If 50%, or half, of the element remains after 4000 years, that means the half life must be 4000 years.

Hope this helps!

personal, she chose to do it.