A) 7 hours
B) 14 hours
C) Less than 7 hours
D) More than 7 hours
Correct Answer: D
Solution :
\[t=\frac{\rho L}{2K\theta }(x_{1}^{2}-x_{2}^{2})\]Þ\[t\propto (x_{2}^{2}-x_{1}^{2})\] Þ \[\frac{t}{t'}=\frac{(x_{2}^{2}-x_{1}^{2})}{(x{{'}_{2}}^{2}-x{{'}_{1}}^{2})}\]Þ \[\frac{9}{t'}=\frac{({{1}^{2}}-{{0}^{2}})}{({{2}^{2}}-{{1}^{2}})}\] Þ \[t'=21\,hours\]
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