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Physics
The surface tension of soap solution is σ . What is the work done in blowing soap bubble of radius r ?
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Q. The surface tension of soap solution is $\sigma .$ What is the work done in blowing soap bubble of radius $r$ ?
Bihar CECE
Bihar CECE 2009
A
$\pi r^{2} \sigma$
B
$2\pi r^{2} \sigma$
C
$4\pi r^{2} \sigma$
D
$8\pi r^{2} \sigma$
Solution:
Work done in blowing a soap bubble $W=\sigma \times 8 \pi r^{2}$ as bubble has two free surfaces.