14. The work done in blowing a soap bubble of radius r of the solution of surface tension T will be
(a) 8πr2T
(b) 2πr2T
(c) 4πr2T
(d) (4/3)πr2T
Ans. a
(6)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)