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The data in the table below shows how the activity of a sample of radium-222 changes with time. Plot a graph of activity against

The data in the table below shows how the activity of a sample of radium-222 changes with time. Plot a graph of activity against time and use the graph to estimate the half-life of this isotope. Elapsed Time At (h) 0 10 20 30 40 50 60 Activity A (Bq) 10000 8333 6944 5787 4822 4016 3344

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