A water drop of radius $1 \mathrm{~cm}$ is broken into 729 equal droplets. If surface tension of water is 75 dyne/ $\mathrm{cm}$, then the gain in surface energy upto first decimal place will be : (Given $\pi=3.14$ )

Question

A water drop of radius $1 \mathrm{~cm}$ is broken into 729 equal droplets. If surface tension of water is 75 dyne/ $\mathrm{cm}$, then the gain in surface energy upto first decimal place will be :

(Given $\pi=3.14$ )

$8.5 \times 10^{-4} \mathrm{~J}$

$8.2 \times 10^{-4} \mathrm{~J}$

$7.5 \times 10^{-4} \mathrm{~J}$

$5.3 \times 10^{-4} \mathrm{~J}$

Solution

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