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  • The excess pressure across a soap bubble of radius r is <img alt="\mathrm{ p=4 \sigma / r}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7B%20p%3D4%20%5Csigma%20/%20r%7D

The excess pressure across a soap bubble of radius r is \mathrm{ p=4 \sigma / r}, where \mathrm{\sigma} is the surface tension of soap solution. What is the excess pressure across an air bubble of the same radius r formed inside a container of soap solution?

Option: 1

\mathrm{\frac{\sigma}{r}}


Option: 2

\mathrm{\frac{2 \sigma}{r}}


Option: 3

\mathrm{\frac{4 \sigma}{r}}


Option: 4

\mathrm{\frac{2 \sqrt{2} \sigma}{r}}


Answers (1)

For an air bubble is formed inside a soap solution, there is only one surface in contact with soap solution. Hence the correct choice is (b).

Posted by

Ramraj Saini

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