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
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a
2TrJ
b
3TRJ
c
3TJ(1r-1R)
d
2TJ(1r-1R)
answer is C.
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Detailed Solution
Rise in temperature, ∆θ = 3TJSd(1r-1R)∴ ∆θ = 3TJ(1r-1R) (For water S = 1 and d = 1)