If the work done in blowing a soap bubble of volume V is W, then the work done in blowing a soap bubble of volume 2V under the same conditions will be
A
W
B
2W
C
W
D
4 1/3 W
Text Solution
Verified by ExpertsThe correct answer is:
D
The work done will be against surface tension and we know that surface tension is
related to work as W = T x 
A
Since, the surface area of sphere is 4 
R 2 and there are two free surfaces, we have
W = T x 8 
R 2 ...(i)
and volume of sphere 
i.e. 
...(ii)
From Eqs. (i) and (ii), we get
and, 
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