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Q.

A number of water droplets each of radius r coalesce to form a drop of radius R. Assuming the whole of the energy liberated due to coalescence goes into heating the drop, the rise in the temperature dθ is :

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a

2TrJ

b

3TrJ

c

3TJ1r−1R

d

3TJ1r+1R

answer is C.

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Detailed Solution

Rise in temp Δθ=3TJρS1r−1Rfor water ρ=1 gm cc−1S=1 cal gm∘C−1∴Δθ=3TJ1r−1R
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