5. Radius of a soap bubble is ‘r’, surface tension of soap solution is T. Then without increasing the temperature, how much energy will be needed to double its radius
(a) 4πr2T
(b) 2 πr2T
(c) 12 πr2T
(d) 24 πr2T
Ans. d
(54)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)