A) \[36\,{{v}_{e}}\]
B) \[12\,{{v}_{e}}\]
C) \[6\,{{v}_{e}}\]
D) \[20\,{{v}_{e}}\]
Correct Answer: B
Solution :
\[v\propto R\sqrt{\rho }\]\ \[\frac{{{v}_{p}}}{{{v}_{e}}}=\frac{{{R}_{p}}}{{{R}_{e}}}\times \sqrt{\frac{{{\rho }_{p}}}{{{\rho }_{e}}}}=4\times \sqrt{9}=12\] Þ \[{{v}_{p}}=12{{v}_{e}}\]
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