A) 1 : 3\[\sqrt{2}\]
B) 1 : 2\[\sqrt{2}\]
C) 1 : 2
D) \[\sqrt{2}\]: 1
Correct Answer: B
Solution :
From the formula \[\frac{{{\upsilon }_{A}}}{{{\upsilon }_{B}}}=\sqrt{\frac{{{T}_{A}}}{{{T}_{B}}}}\times \frac{{{r}_{B}}}{{{r}_{A}}}\] \[=\sqrt{\frac{T}{2T}}\times \frac{r}{2r}=\frac{1}{2\sqrt{2}}\]
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