- #1
sklotz
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Homework Statement
After 25 years, 60% of a radioactive material decays. What is the half-life?
Homework Equations
I used a ratio of 25/.60= x/.50
The Attempt at a Solution
I also tried this ratio as 25/.40= x/.50 I am not really sure what equation I should be using but this ratio set up isn't getting me the correct answer