NEET Physics Mechanical Properties of Fluids Questions Solved

Radius of a soap bubble is 'r', surface tension of soap solution is T. Then without increasing the temperature, how much energy will be needed to double its radius

(a) 4πr2T                        (b) 2πr2T

(c) 12πr2T                       (d) 24πr2T

(d) W=8πT(R22-R12)=8π(2r)2-(r)2=24πr2T

Difficulty Level:

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