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20. Surface tension of a soap solution

is 1.9 x 10-2N/m . Work done in blowing a bubble of 2.0 cm diameter will be

(a)  7.6 x 10-6  π  joule                     

(b) 15.2 x 10-6 π joule

(c) 1.9 x 10-6 π joule

(d) 1 x 10-4 π joule

Ans. b

(24)

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