A) 1/2 h
B) 1 h
C) 2 h
D) 4 h
Correct Answer: C
Solution :
\[\frac{{{T}_{2}}}{{{T}_{1}}}={{\left( \frac{{{r}_{2}}}{{{r}_{1}}} \right)}^{3/2}}\,\Rightarrow \,{{T}_{2}}=24\,{{\left( \frac{6400}{36000} \right)}^{3/2}}\cong 2\,hour\]
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