A) 45 minutes
B) 15 minutes
C) 60 minutes
D) None of these
Correct Answer: C
Solution :
\[k=\frac{0.693}{30}=0.0231\] ; \[t=\frac{2.303}{k}\log \left( \frac{100}{100-75} \right)\] \[t=\frac{2.303}{0.0231}\log 4=60\,\text{minutes}\]You need to login to perform this action.
You will be redirected in
3 sec