A) 20000 dps
B) 40000 dps
C) 7500 dps
D) 10000 dps
Correct Answer: A
Solution :
[a] Activity of sample becomes 2500 from 5000 in 75 days therefore its half-life is 75 days, so \[R=\frac{{{R}_{0}}}{{{2}^{\frac{150}{75}}}}=5000\Rightarrow {{R}_{0}}=5000\times 4=20,000\]
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