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Q.

A water drop of radius 1 mm is sprayed into 106  droplets of the same size at constant temperature. If surface tension of water is 72×10−3  N/m, then the work done is 

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a

8.95×10−5erg

b

17.90×10−5J

c

8.95×10−5J

d

17.90×10−5erg

answer is B.

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Detailed Solution

W=T4πR2n1/3−1

=72×10−3×4×π×10−32100−1=8.95×10−5J

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