Two soap bubbles and are kept in a closed chamber where the air is maintained at pressure

PHYSICS · Subjective · CBSE · Physics · Mechanical Properties of Fluids · Mechanical Properties of Fluids

Problem

Two soap bubbles

A

and

B

are kept in a closed chamber where the air is maintained at pressure

8 \text{ N/m}^2

. The radii of bubbles

A

and

B

are 2 cm and 4 cm, respectively. Surface tension of the soap-water used to make bubbles is

0.04 \text{ N/m}

. Find the ratio

n_B/n_A

, where

n_A

and

n_B

are the number of moles of air in bubbles

A

and

B

, respectively. [Neglect the effect of gravity.]