PhysicsMedium148×since 2002Q8014A large number of water drops, each of radius r, combine to have a drop of radius R. If the surface tension is T and mechanical equivalent of heat is J, the rise in heat energy per unit volume will be :A2TJ(1r−1R){{2T} \over J}\left( {{1 \over r} - {1 \over R}} \right)J2T(r1−R1)B3TJ(1r−1R){{3T} \over J}\left( {{1 \over r} - {1 \over R}} \right)J3T(r1−R1)C3TrJ{{3T} \over rJ}rJ3TD2TrJ{{2T} \over rJ}rJ2TCheck answerSkip