Radius of a soap bubble is r, surface tension of soap solution is t. Then without incresing the temperature how much energy will be needed to double its radius?
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To increasing the radius of soap bubble,we have to increase the pressure inside the soap bubble and decrease the pressure out side it.
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Answer:
Explanation:
soap bubble has two free surfaces.
So, increase in surface area,
if radius get doubled is dA=2×[4π(2r)2−4πr2]=24πr2
The energy spent will beE=W=S×dA=S×24πr2A
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