Test your knowledge on surface tenstion
Classical Mechanics
Level
pending
There is a soap bubble inside an another soap bubble. The bubbles are neither expanding nor contracting. choose the correct answer based on the two situations below 1. The inner bubble bursts 2. The outer bubble bursts
radius of bubble in first case increases and decreases in second case
radius of bubble in first case decreases and in second case increases
radius of both the bubbles increases.
radius of the bubbles in both cases decreases
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1 solution
for a bubble, pi-po = 4T/r, where
pi= pressure inside the bubble po= pressure outside the bubble
case 1
if the inner bubble bursts pi of the outer bubble increases where as po remains same. ie. force inside the bubble is more than force outside. Therefore, bubble expands
case 2
if the outer bubble bursts, pi is same but po will decrease. ie. force inside the bubble is more than the force outside. Therefore, bubble expands