A water drop of radius \( 1 \mathrm{~cm} \) is broken into 729 equal droplets. If surface tensio...

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A water drop of radius \( 1 \mathrm{~cm} \) is broken into 729 equal droplets. If surface tension of water is \( 75 \mathrm{dyne} / \mathrm{cm} \), then the gain in surface energy upto first decimal place will be : [Given \( \pi=3.14] \)
(a) \( 8.5 \times 10^{-4} \mathrm{~J} \)
(b) \( 8.2 \times 10^{-4} \mathrm{~J} \)
(c) \( 7.5 \times 10^{-4} \mathrm{~J} \)
(d) \( 5.3 \times 10^{-4} \mathrm{~J} \)
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