# Water rises in a capillary tube upto a height of 10 cm whereas mercury depresses in it by 3.42 cm. If the angle of contact and density of mercury are $135^{\circ}$ and 13.6 gm/cc respectively, then the ratio of the surface tension of water and mercury will be nearly

$\begin {array} {1 1} (1)\;13 : 2 & \quad (2)\;5 : 16 \\ (3)\;16 : 5 & \quad (4)\;2 : 13 \end {array}$

(4) 2 : 13