Write shorts notes on the oscillations of liquid column in U-tube.

Explanation

(i) Consider a U - shaped glass tube which consists of two open arms with uniform cross- sectional area. Pour a non-viscous uniform incompressible liquid of density `rho` in the U - shaped tube to a height h.
(ii) If the liquid and tube are not disturbed then the liquid surface will be in equilibrium position O.
(iii) It means the pressure as measured at any point on the liquid is the same and also at the surface on the arm (edge of the tube on either side), which balances with the atmospheric pressure.
(iv) Due to this the level of liquid in each arm will be the same. By blowing air one can provide sufficient force in one arm. and the liquid gets disturbed from equilibrium position O, which means , that the pressure at blown arm is higher than the other arm.
(v) This creates difference in pressure which will cause the liquid to oscillate for a very short duration of time about the mean or equilibrium position and finally comes to rest. Time period of the oscillation is
`T=2pisqrt((l)/(2g))` second
`lrarr` length of the liquid column in U - tude