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B. A radioisotope lab created a new radioactive isotope. In order to determine the of new isotope, workers measured its mass over time and plotted their data on the curve below. Use the decay curve to answer the following questions. (8 points) half-life the Radioactive Decay 1.4 1.2 1.0 0.8 0.6 0.4 1 0.2 o 1 23 45 67 89 10 Time (minutes) i. What was the half-life of the new isotope?(4 points) i. How much of the sample had decayed after 8 minutes? (4 points)
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g s 0.69 . So From GRmW y min timE TAKEN TD REACH 0.ba Is 2 T. 2. k: 0.683 -0.,#325 mini 4 min R T T=8min z 1.2 -0·19 325 8

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