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Two soap bubbles in vacuum of radius `3cm` and` 4cm` coalesce to form a single bubble, in same temperature. What will be the radius of the new bubbleA. `7cm`B. `(12)/(7) cm`C. `12cm`D. `5cm` |
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Answer» Correct Answer - D `n=n_(1)+n_(2)` ` (pV)/(RT)=(p_(1)V_(1))/(RT)+(p_(2)V_(2))/(RT)` or, `pV=p_(1)v_(1)+p_(2)v_(2)` `:. ((4t)/(r ))(4/3 pir^(3))=((4t)/(r_(1) ))(4/3 pir_(1)^(3))` `+((4t)/(r_(2)))(4/3 pir_(2)^(3))` `:. r=sqrt(r_(1)^(2)+r_(2)^2)` `=5cm`. |
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