The excess of pressure across a soap bubble of radius r is p=4T/r. where T is surface tension of soap solution. What is the excess of pressure across an air bubble of the same radius r formed inside a container of soap solution ?
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a
T/r
b
2T/r
c
4T/r
d
8T/r
answer is B.
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Detailed Solution
For an air bubble formed inside the soap solution, there is only one surface in contact with soap solution. Hence the excess of pressure is half that of a soap bubble. ∴ Excess of pressure =12×4Tr=2Tr
The excess of pressure across a soap bubble of radius r is p=4T/r. where T is surface tension of soap solution. What is the excess of pressure across an air bubble of the same radius r formed inside a container of soap solution ?