4. A drop of liquid of diameter 2.8 mm breaks up into 125 identical drops. The change in energy is nearly (S.T. of liquid =75 dynes/cm)
(a) Zero
(b) 19 erg
(c) 46 erg
(d) 74 erg
Ans. d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a