Question

If two soap bubbles of different radii are connected by a tube,

(a) air flows from the bigger bubble to the smaller bubble till the sizes become equal

(b)air flows from bigger bubble to the smaller bubble till the sizes are interchanged

(c) air flows from the smaller bubble to the bigger

(d) there is no flow of air.

Answer 1

(c) : Pressure inside the bubble = p₀ + 4T/r

Smaller the radius, greater will be the pressure. Air flows from higher pressure to lower pressure. Hence air flows from the smaller bubble to the bigger.