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Atomic Physics Assignment Booklet 11 4. An unknown substance undergoes radioactive decay according to the graph below. Activity as a Function of Time 2000 1500

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Atomic Physics Assignment Booklet 11 4. An unknown substance undergoes radioactive decay according to the graph below. Activity as a Function of Time 2000 1500 Activity (Bq) 1000 500 15 20 Time (a) 1 a. Using the graph above, determine the half-life of the substance. b. Identify the substance using the chart below. Isotope Half-Life (a) Decay Mode 204TL 3.78 B - negative 22.3 B - negative 7880 a goTh PH 12.3 B - negative 252 Es 1.29 a

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