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 ergs                     (b) 180 ergs
(c) 1800 ergs                  (d) 8000 ergs

(c) 

W=4πR2T(n1/3-1)=4π×1×50(103/3-1)= 1800 π erg

Difficulty Level:

  • 7%
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  • 50%
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