After what length of time does Bi-210 (obtained from Pb-210) reach the maximum of its activity in a generator? The half-life of Bi-210 is 5 days, and that of Pb-210 is 22.6 years.
A) 8.99 × 10-4 d
B) 8.99 × 10-2 d
C) 13.9 d
D) 53.4 d
Correct Answer:
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