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

Options

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 smaller bubble till the sizes are interchanged
D. there is no flow of air

Answer

C

Explanation

The excess pressure inside the soap bubble is inversely proportional to radius of soap bubble i.e., `p prop 1//r`, where r being radius of soap bubble. It follows that pressure inside a smaller bubble is greater than that inside a bigger bubble. Thus, if these two bubbles are connected by a tube, air will flow from smaller bubble to bigger bubble and the bigger bubble grows at the expense of the smaller one.