A) 2 hours
B) 1.5 hours
C) 1 hours
D) 2.5 hours
Correct Answer: B
Solution :
Using\[\frac{A}{{{A}_{0}}}={{\left( \frac{1}{2} \right)}^{t/T}}\]or\[\frac{1}{32}={{\left( \frac{1}{2} \right)}^{7.5/T}}\]or\[{{\left( \frac{1}{2} \right)}^{5}}={{\left( \frac{1}{2} \right)}^{7.5/T}}\]or\[5=\frac{7.5}{T}\]i.e. \[T=1.5\]hours
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