Question

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

Answer 1

The correct option is D

74 erg

$E=4\pi R^{2}T(n^{1/3}-1)$

$=4\times 3.14\times (1.4\times {10}^{-1}{)}^2\times 75({125}^{1/3}-1)=74erg$