A number of droplets, each of radius \( r \), combine to form a drop of radius \( R \). If \( T ...

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A number of droplets, each of radius \( r \), combine to form a drop of radius \( R \). If \( T \) is the surface tension, the rise in temperature will be
(1) \( \frac{2 T}{r} \)
(2) \( \frac{3 T}{R} \)
(3) \( 2 T\left[\frac{1}{r}-\frac{1}{R}\right] \)
(4) \( 3 T\left[\frac{1}{r}-\frac{1}{R}\right] \)
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