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Help thanks Text question Activity as a Function of Time for a Sample of Barium-137 5 000 4 000- 3 000 Activity (counts per minute)

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Text question Activity as a Function of Time for a Sample of Barium-137 5 000 4 000- 3 000 Activity (counts per minute) 1 000 12 Time (minutes) 21. The activity of this sample after 3 half-lives have elapsed is approximately 2080 counts/min 260 counts/min 1900 counts/min 520 counts/min

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