If 1000 droplets of water of surface tension $0.07 \mathrm{~N} / \mathrm{m}$, having same radius $1 \mathrm{~mm}$ each, combine to from a single drop. In the process the released surface energy is :- $\left( {\mathrm{Take}\,\pi = {{22} \over 7}} \right)$

Question

If 1000 droplets of water of surface tension $0.07 \mathrm{~N} / \mathrm{m}$, having same radius $1 \mathrm{~mm}$ each, combine to from a single drop. In the process the released surface energy is :-

$\left( {\mathrm{Take}\,\pi = {{22} \over 7}} \right)$

$7 .92 \times 10^{-4} \mathrm{~J}$

$7 .92 \times 10^{-6} \mathrm{~J}$

$8 .8 \times 10^{-5} \mathrm{~J}$

$9 .68 \times 10^{-4} \mathrm{~J}$

Solution

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