Which of the following statements are correct ?

Options

A. A needle can float on clear water but sinks when some detergent is added to it. This is because addition of detergent reduces the surface tension of water
B. Angle of contact between pure water and silver is `90^@`
C. The potential energy of molecules in the surface film is greater than that of those molecules which are inside the liquid
D. An air bubble of radius R in water is at a depth h below the water surface. If` P_0` is atmospheric pressure and ` rho & sigma` are the density and surface tension of water respectively, then the pressure inside the bubble will be `P_0 + h rho g +(2 sigma)/(R )`

Answer

A, B, C, D