Two spherical soap bubbles of radii r1 and r2 in vacuum combine under isothermal conditions. The resulting bubble has a radius equal to :

Question

Two spherical soap bubbles of radii r₁ and r₂ in vacuum combine under isothermal conditions. The resulting bubble has a radius equal to :

${{{r_1}{r_2}} \over {{r_1} + {r_2}}}$

$\sqrt {{r_1}{r_2}} $

$\sqrt {r_1^2 + r_2^2} $

${{{r_1} + {r_2}} \over 2}$

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