A) 96.4 min
B) 68 min
C) 964 min
D) 680 min
Correct Answer: A
Solution :
For 25% decay \[K=\frac{2.303}{20}\log \frac{100}{75}=\frac{2.303}{20}\times 0.1249=0..1438\] For 75% decay, \[t=\frac{2.303}{0.01438}\log \frac{100}{25}=96.4\]minute.You need to login to perform this action.
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