Surface tension of a soap solution is 1.9×10-2 N/m. Work done in blowing a bubble of 2.0 cm diameter will be

(a) 7.6×10-6 π joule                    (b) 15.2×10-6 π joule

(c) 1.9×10-6 π joule                    (d) 1×10-4 π joule 

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