Prove that if two bubbles of radii `r_(1)` and `r_(2)` coalesce isothermally in vacuum then the radius of new bubble will be `r=sqrt(r_(1)^(2)+r_(2)^(2))`

Options

A. `R=(r_(1)+r_(2))//2`
B. `R=[r_(1)r_(2)//(r_(1)-r_(2))]`
C. `R=sqrt((r_(1)^(2)+r_(2)^(2)))`
D. `R=r_(1)+r_(2)`

Answer

B