A. 200 count / min
B. 100 count / min
C. 50 count / min
D. 25 count / min
Correct Answer:
Option C – 50 count / min
Explanation
116 days = 4 half-lives
Thus, after 4 half lives the fraction left of any radioactive materials is given by (1/2)4 = 1/16
∴ Count rate / amount left = 1/16 x 800/1
= 50 count / min
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