The angle of contact between glass and water is `0^@` and surface tension is `70 dyn//cm`. Water rises in a glass capillary up to `6 cm`. Another liquid of surface tension `140 dyn//cm`, angle of contact `60^@` and relative density `2` will rise in the same capillary up to

Options

A. 12 cm
B. 24 cm
C. 3 cm
D. 6 cm

Answer

C

Explanation

`(h_(2))/(h_(1))=(sigma_(2)costheta_(2))/(rho_(2))xx(rho_(1))/(sigma_(1)costheta_(1))`
Or `(h_(1))/(hl_(2))=(140xx(1)/(2))/(2)xx(1)/(70xx1)` or `h_(2)=(h_(1))/(2)=(6)/(2)cm=3cm`