Question

Water rises to a height of 10 cm in a capillary tube and mercury falls to a depth of 3.42 cm in the same capillary tube. If the density of mercury is13.6 kg/m^3 and angle of contact is 135^°, the ratio of surface tension for water and mercury is (angle of contact for water and glass is 0^°). (1) 1:0.5, (2) 1:3, (3) 1:6.5, (4) 1.5:

Answer 1