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Q.

Calculate the work done against surface tension in blowing a soap bubble from a radius 10 cm to 20 cm if the surface tension of soap solution is 25 x 10-3 N/m.

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An Intiative by Sri Chaitanya

a

6π x 10-3 J

b

4π x 10-3 J

c

5π x 10-3 J

d

π x 10-3 J

answer is A.

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Detailed Solution

ΔA=2 x (4πr22-4πr12)=8π[(0.2)2-(0.12)] W=TΔA=25 x 10-3x 0.24π=6π x 10-3J

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