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Question 15. Activity as a Function of Time for a Sample of Barium-137 $.000- 4000- 3000- 2000- 1000- 04 10 Time (minutes) The activity of this sample after 3 half-lives have clapsed is approximately A. 260 counts/min B. 520 counts/min C. 1900 counts/min D. 2.080 counts/min Question 16. The energy equivalence of the mass of one alpha particle, expressed in units of joules, in scientific notation to two significant digits, is a.b x 10-cd J. The values of a, b, c, and d and are (Record all four digits of your answer in the numerical-response section on the answer sheet.) Activity (counts per minute)