1. Energy needed in breaking a drop of radius R into n drops of radii r is given by
(a) 4πT(nr2-R2)
(b) (4/3)π(r3n-R2)
(c) 4πT(R2-nr2)
(d) 4πT(nr 2 + R2)
Ans.a
(5)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)