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

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 (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

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 is option

Q. 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

As excess pressure inside the soap bubble of radius r , is P=r4S​ or P∝r1​ Therefore as r increases with time, P decreases So the variation of P with time t will be a parabolic curve as shown is option

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 is option