Question

A soap bubble has radius R and thickness d (<< R) as shown. It collapses into a spherical drop. The ratio of excess pressure in the drop to the excess pressure inside the bubble is

• A. ${\left(\frac{R}{3d}\right)}^{\frac{1}{3}}$
• B. ${\left(\frac{R}{6d}\right)}^{\frac{1}{3}}$
• C. ${\left(\frac{R}{24d}\right)}^{\frac{1}{3}}$
• D. None

Answer 1

The correct option is C

${\left(\frac{R}{24d}\right)}^{\frac{1}{3}}$