First slide

Surface tension and surface energy

Question

A soap bubble formed at the end of the tube is blown very slowly. The graph between excess of pressure inside the bubble with time is

Moderate

A
B
C
D

Solution

As excess pressure inside the soap bubble of radius r, is $P = \frac{4 S}{r} or P \propto \frac{1}{r}$
Therefore as r increases with time, P decreases
So the variation of P with time t will be a parabolic curve as shown in option (b).

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