Change in surface energy when a drop splits into droplets or droplets coalesce

1. A.
   $\frac{2\text{ }T}{rJ}$
2. B.
   $\frac{3T}{rJ}$
3. C.
   $\frac{2T}{J}\left( \frac{1}{r} - \frac{1}{R} \right)$
4. D.
   $\frac{3T}{J}\left( \frac{1}{r} - \frac{1}{R} \right)$

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1. A.
   $2.8 \times 10^{- 4}\text{ }J$
2. B.
   $1.5 \times 10^{- 3}\text{ }J$
3. C.
   $1.9 \times 10^{- 4}\text{ }J$
4. D.
   $9.4 \times 10^{- 5}\text{ }J$

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1. A.
   $8.5 \times 10^{- 4}\text{ }J$
2. B.
   $8.2 \times 10^{- 4}\text{ }J$
3. C.
   $7.5 \times 10^{- 4}\text{ }J$
4. D.
   $5.3 \times 10^{- 4}\text{ }J$

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1. A.
   $8.8 \times 10^{- 5}\text{ }J$
2. B.
   $7.92 \times 10^{- 4}\text{ }J$
3. C.
   $7.92 \times 10^{- 6}\text{ }J$
4. D.
   $9.68 \times 10^{- 4}\text{ }J$

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1. A.
   $28 \times 10^{- 5}\text{ }J$
2. B.
   $17.5 \times 10^{- 5}\text{ }J$
3. C.
   $5 \times 10^{- 5}\text{ }J$
4. D.
   $2.26 \times 10^{- 5}\text{ }J$

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1. A.
   $8\pi R^{2}T$
2. B.
   $3\pi R^{2}T$
3. C.
   $\frac{1}{8}\pi R^{2}T$
4. D.
   $4\pi R^{2}T$

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1. A.
   15 J
2. B.
   10 J
3. C.
   20 J
4. D.
   5 J

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1. A.
   $4\pi r^{2}\text{ }T\left\lbrack 2 - 2^{\frac{2}{3}} \right\rbrack$
2. B.
   $4\pi r^{2}\text{ }T\left\lbrack 2 - 2^{\frac{1}{3}} \right\rbrack$
3. C.
   $4\pi r^{2}T\lbrack 1 + \sqrt{2}\rbrack$
4. D.
   $4\pi r^{2}\text{ }T\lbrack\sqrt{2} - 1\rbrack$

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1. A.
   10
2. B.
   7
3. C.
   8
4. D.
   11

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1. A.
   $8\pi r^{2}S$
2. B.
   $16\pi r^{2}S$
3. C.
   $64\pi r^{2}S$
4. D.
   $4\pi r^{2}S$

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