A) \[4:1\]
B) \[1:4\]
C) \[2:1\]
D) \[1:2\]
Correct Answer: B
Solution :
The formula for terminal velocity is given by \[\upsilon =\frac{2}{9}{{r}^{2}}\frac{[g(\rho -\sigma )]}{\eta }\] \[\eta =\]Coefficient of viscocity So, \[\upsilon \propto {{r}^{2}}\] Hence, \[\frac{{{\upsilon }_{1}}}{{{\upsilon }_{2}}}={{\left( \frac{{{r}_{1}}}{{{r}_{2}}} \right)}^{2}}={{\left( \frac{1}{2} \right)}^{2}}=\frac{1}{4}\]
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