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{"ops":[{"insert":"\nThe data recorded in the table below gives results for the activity of a\u00a0short lived radioactive isotope. Activity is the number of emissions\/second its units are the Becquerel which equals 1 emission\/second. Use the data to draw a graph of count rate against time for the\u00a0short lived\u00a0radioactive isotope.\u00a0\n\u00a0\n\u2022\u00a0Use your graph to calculate a value of the half-life of this isotope.\u00a0\n\u2022\u00a0Calculate decay constant for this material.\u00a0Show all calculations.\u00a0\u00a0\n\nTime (seconds)      Activity (Becquerels)\n0                             400\n20                           330\n40                           270\n60                           220\n80                           190\n100                         150\n120                         120\n140                         100\n160                         90\n180                         80\n200                         70\n220                         60\n240                         50\n"}]}

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