Calculate the energy liberated when 125 identical water drops combine together to form a big drop. The radius of a single water drop is 0.1 mm and surface tension of water is 0.072 N/m

1
9.04 × 10-7 J
2
3.34 × 10-7 J
3
4.36 × 10-7 J
4
7.86 × 10-7 J

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