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Q.

When a big drop of water is formed from n small drops of water, the energy loss is 3E where E is energy of bigger drop. If R is radius of bigger drop and r is radius of smaller drop then number of smaller drops(n) is

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a

4Rr

b

4Rr2

c

4R2r2

d

2R2r

answer is C.

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Detailed Solution

ΔE=3E;4πTnr2−R2=34πR2Tnr2−R2=3R2⇒nr2=4R2⇒n=4R2r2

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