25. A liquid drop of diameter D breaks upto into 27 small drops of equal size. If the surface tension of the liquid is σ, then change in surface energy is
(a) π D2 σ
(b) 2 π D2 σ
(c) 3 π D2 σ
(d) 4 π D2 σ
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a