1.

A large number of water drops each of radius r combine to have a drop of radius R. If the surface tension is T and the mechanical equivalent of heat is J, then the rise in temperature will be                              [MP PET 1994; DPMT 2002]

A. \[\frac{2T}{rJ}\]                   
B. \[\frac{3T}{RJ}\]
C. \[\frac{3T}{J}\left( \frac{1}{r}-\frac{1}{R} \right)\]
D. \[\frac{2T}{J}\left( \frac{1}{r}-\frac{1}{R} \right)\]
Answer» D. \[\frac{2T}{J}\left( \frac{1}{r}-\frac{1}{R} \right)\]


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