The level of radioactivity on the site of a nuclear explosion is decaying exponentially. The level measured in 1970 was found to be 0.7 times the level measured in 1960. What is the half-life. (the amount of years)
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Radioactivity in 1970 = Radioactivity in 1960 = But [Divide by y] I think this is the rate at which it is decaying. I'll spend a little more time on it... EDIT: Okay i got it! We now have the rate, so we want to know when
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