MHT CET 2023 Physics question
Two spherical soap bubbles of radii 'a' & 'b' in vacuum coalesce under isothermal conditions. The resulting bubble has a radius equal to
Answer: (C)
Solution
In vacuum the pressure outside is zero, so the pressure inside a bubble is the excess pressure . For isothermal coalescence, the total is conserved (Boyle's law applied to the total amount of gas): . Substituting: $·π +
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