A soap bubble of the radius 3 cm is formed inside another soap bubble of radius, 6 cm . The radius of an equivalent soap bubble that has the same excess pressure as inside the smaller bubble with respect to the atmospheric pressure is____ cm .

Step-by-step solution

The formula of excess pressure inside the soap bubble is, 4 T R here T is the surface tension and R is the radius of the soap bubble, ⇒ P 0 + 4 T 6 + 4 T 3 = P 0 + 4 T R ⇒ 1 6 + 1 3 = 1 R ⇒ R = 2   cm .