If a soap bubble of radius 3 cm coalesce in vacuum under isothermal conditions with another soap bubble of radius 4 cm find the radius of the big bubble so formed.

If a soap bubble of radius 3 cm coalesce in vacuum under isothermal co

1.	If a soap bubble of radius 3 cm coalesce in vacuum under isothermal conditions with another soap bubble of radius 4 cm find the radius of the big bubble so formed.
Answer» SOLUTION :`r_(1)=3cm,r_(2)=4cm` Let R be the radius of the big drop surface energy of big drop = Surface enegy of FIRST drop + surface energy of second drop `:.8piR^(2)S=(8pir_(1)^(2)+8pir_(2)^(2))S` `R=sqrt(r_(1)^(2)+r_(2)^(2))=sqrt(3^(2)+4^(3))=5cm`