A 7.85 *10¯5 mol sample of copper-61 emits 1.47 *1019 positrons in 90.0 minutes. What is the decay constant for copper-61?
A) 0.00230 h¯1
B) 0.00346 h¯1
C) 0.207 h¯1
D) 0.311 h¯1
E) None of these choices is correct.
Correct Answer:
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