9. If T is the surface tension of soap solution, the amount of work done in blowing a soap bubble from a diameter D to 2D is
(a) 2 πD2T
(b) 4 πD2T
(c) 6 πD2T
(d) 8 πD2T
Ans. c
(11)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)