13. A spherical drop of oil of radius 1 cm is broken into 1000 droplets of equal radii. If the surface tension of oil is 50 dynes/cm, the work done is
(a) 18 π ergs
(b) 180 π ergs
(c) 1800 π ergs
(d) 8000 π ergs
Ans. c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a