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1. It takes 0.7995 years for 10.0% of a sample of 60Co to decay. What is the half-life of 60Co? 2. Measurements on the linen

1. It takes 0.7995 years for 10.0% of a sample of 60Co to decay. What is the half-life of 60Co?

2. Measurements on the linen wrappings from the Book of Isaiah in the Dead Sea scrolls suggest that the scrolls contain 79.5% of the 14C expected of living tissue. How old are the scrolls?

3. If there is 67.8% of the original amount of 238U, how long has it been around?

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