A) \[{{v}_{e}}\]
B) \[2{{v}_{e}}\]
C) \[4{{v}_{e}}\]
D) \[\frac{{{v}_{e}}}{2}\]
Correct Answer: B
Solution :
\[v=\sqrt{2gR}\] Þ \[\frac{{{v}_{p}}}{{{v}_{e}}}=\sqrt{\frac{{{g}_{p}}}{{{g}_{e}}}\times \frac{{{R}_{p}}}{{{R}_{e}}}}=\sqrt{1\times 4}=2\] \ \[{{v}_{p}}=2{{v}_{e}}\]
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