Properties of Matter 4 Question 10
12. After the drop detaches, its surface energy is
(a) $1.4 \times 10^{-6} \mathrm{~J}$
(b) $2.7 \times 10^{-6} \mathrm{~J}$
(c) $5.4 \times 10^{-6} \mathrm{~J}$
(d) $8.1 \times 10^{-9} \mathrm{~J}$
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Answer:
Correct Answer: 12. (b)
Solution:
- Surface energy, $E=\left(4 \pi R^{2}\right) T$
$$ \begin{aligned} & =(4 \pi)\left(1.4 \times 10^{-3}\right)^{2}(0.11) \\ & =2.7 \times 10^{-6} J \end{aligned} $$
$\therefore$ Correct option is (b).
