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Q.

A soap bubble of radius R is blown from a soap solution. After heating the solution, a second bubble of radius 2R is blown. The work required to blow the second bubble in comparison to that required for the first bubble is:

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a

Double

b

Slightly less than double

c

Slightly less than four times

d

Slightly more than four times

answer is C.

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Detailed Solution

energy of a soap bubble is 8πR2T when R is double energy will be four times but as temperature increases surface tension decreases so energy will be little less than four times

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