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

Options

A.
B.
C.
D.

Answer

B

Explanation

As excess pressure inside the soap bubble of radius r, is
`P=(4S)/(r)` or `P prop (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 (b)