A) 6 hour
B) 12 hour
C) 24 hour
D) 3 hour
Correct Answer: A
Solution :
For rotating earth its angular momentum \[{{I}_{\omega }}\]remains constant. If radius is halved then its moment of Inertia (\[I\]) will become one fourth. for \[{{I}_{\omega }}\] to remain constant. Its angular velocity \[\omega \]becomes four time. So, duration of day\[\begin{align} & =\frac{24}{4} \\ & =6\,\text{hrs} \\ \end{align}\]
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