1. The problem statement, all variables and given/known data A radioactive material has a half life of 1550 years. Find the time during which a given amount of this material is reduced to one forth. I am really not sure how to do this since we have not covered it in class yet. But, a formula that I have found involves find the k value (whatever that is) of a 1550 half life. k=ln2/1550 = 6.65 Any guidance please?