A) 20 hours
B) 10 hours
C) \[7\frac{1}{2}\] hours
D) 5 hours
Correct Answer: C
Solution :
[c] \[k=\frac{0.693}{45}\] further \[t=\frac{2.303}{0.693}\times 45\log \frac{100}{100-99.9}\] \[=\frac{2.303\times 45\times 3}{0.693}=7\frac{1}{2}hours.\]You need to login to perform this action.
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