A) Air flows from larger bubble into the smaller one
B) The size of the bubbles remains the same
C) Air flows from the smaller bubble into the larger one and the larger bubble grows at the expense of the smaller one
D) The air flows from the larger
Correct Answer: C
Solution :
Excess of pressure in a soap bubble \[(p)=\frac{4T}{R}\] where T is surface tension of soap solution and R is the radius of die bubble. \[\therefore \] \[P\propto \frac{1}{R}\] Therefore, pressure is greater in soap bubble of smaller radius. Hence, air will flow from the smaller bubble into the larger bubble and the larger bubble grows at the expense of the smaller one.
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