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The results of activity measurements on a radioactive sample are given in the table. First convert the values in the time column into seconds. Using Equation 30.6 as a guide, make a linearized graph of the activity as a function of time. Use a linear “best fit” to the resulting curve to determine (a) the decay constant of the sample, (b) the sample’s half-life, and (c) the number of radioactive nuclei that were present in the sample at t = 0.
Time (h) | Activity (Bq) |
0 | 20,000 |
1.0 | 12,600 |
2.0 | 7940 |
4.0 | 3150 |
7.0 | 790 |

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