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A number of water droplets each of radiu...

A number of water droplets each of radius r coalesce to from a drop of radius `R`. Then the rise in temperature `d theta` is.

A

`frac (2T)(rJ)`

B

`frac (3T)(J)(1/r-1/R)`

C

`frac(-3t)(rJ)`

D

`frac(3T)(rhoJ)(1/r+1/R)`

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