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Solve using paper please An unknown substance undergoes radioactive decay according to the graph below. Activity as a Function of Time 2000 1500 Activity (Bq)

Solve using paper please

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An unknown substance undergoes radioactive decay according to the graph below. Activity as a Function of Time 2000 1500 Activity (Bq) 1000 500 10 15 20 Time (a) Using the graph above, determine the half-life of the substance Identify the substance using the chart below.' Isotope Half-Life (a) Decay Mode 204 TI 3.78 B - negative 218 pb 22.3 B - negative 228 Th 7880 O 12.3 B -negative 283 Es 1.29 Write the nuclear decay equation for the substance

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