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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

(30)

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