A cylinder has 'r' as the radius of the base and 'h' as the height. The radius of base of another cylinder, having double the volume but the same height as that of the first cylinder must be equal to

A cylinder has 'r' as the radius of the base and 'h' as the height. The radius of base of another cylinder, having double the volume but the same height as that of the first cylinder must be equal to
1). $\frac{r}{\sqrt{2}}$
2). 2r
3). $r\sqrt{2}$
4). $\sqrt{2r}$

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