8000 identical water drops are combined to form a big drop. Then the ratio of the final surface energy to the initial surface energy of all the drops together is
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a
1 : 10
b
1 : 15
c
1 : 20
d
1 : 25
answer is C.
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Detailed Solution
As volume remains constant R3=8000r3∴R=20r Surface energy of one big drop Surface energy of 8000 small drop =4πR2T8000(4πr2T)=R28000r2=(20r)28000r2=120
8000 identical water drops are combined to form a big drop. Then the ratio of the final surface energy to the initial surface energy of all the drops together is