8. The amount of work done in blowing a soap bubble such that its diameter increases from d to D is (T= surface tension of the solution)
(a) 4π(D2-d2)T
(b) 8π(D2-d2)T
(c) π(D2-d2)T
(d) 2π(D2-d2)T
Ans. d
(8)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)