2. 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
(a) 2T/rJ
(b) 3T/RJ
(c) 3T/J[(1/R )-(1/R)]
(d) 2T/J[(1/r)-(1/R)]
Ans. c
(32)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)